There are dozens of smaller plates, the seven largest of which are:
Plate tectonics, from Greek "builder" or "mason", is a theory of geology that has been developed to explain the observed evidence for large scale motions of the Earth's lithosphere. The theory encompassed and superseded the older theory of continental drift from the first half of the 20th century and the concept of seafloor spreading developed during the 1960s.
Plate tectonics is a theory of geology that has been developed to explain the observed evidence for large scale motions of the Earth's lithosphere. The theory encompassed and superseded the older theory of continental drift from the first half of the 20th century and the concept of seafloor spreading developed during the 1960s.
The outermost part of the Earth's interior is made up of two layers: above is the lithosphere, comprising the crust and the rigid uppermost part of the mantle. Below the lithosphere lies the asthenosphere. Although solid, the asthenosphere has relatively low viscosity and shear strength and can flow like a liquid on geological time scales. The deeper mantle below the asthenosphere is more rigid again. This is, however, not due to cooler temperatures but due to high pressure.
The lithosphere is broken up into what are called tectonic plates, in the case of Earth, there are seven major and many minor plates (see list below). The lithospheric plates ride on the asthenosphere. These plates move in relation to one another at one of three types of plate boundaries: convergent or collision boundaries, divergent or spreading boundaries, and transform boundaries. Earthquakes, volcanic activity, mountain-building, and oceanic trench formation occur along plate boundaries. The lateral movement of the plates is typically at speeds of 0.66 to 8.50 centimeters per year.
The lithosphere essentially "floats" on the asthenosphere and is broken-up into ten major plates: African, Antarctic, Australian, Eurasian, North American, South American, Pacific, Cocos, Nazca, and the Indian plates. These plates (and the more numerous minor plates) move in relation to one another at one of three types of plate boundaries: convergent (two plates push against one another), divergent (two plates move away from each other), and transform (two plates slide past one another). Earthquakes, volcanic activity, mountain-building, and oceanic trench formation occur along plate boundaries (most notably around the so-called Pacific Ring of Fire).
Plate tectonic theory arose out of two separate geological observations: continental drift, noticed in the early 20th century, and seafloor spreading, noticed in the 1960s. The theory itself was developed during the late 1960s and has since almost universally been accepted by scientists and has revolutionized the Earth sciences akin to the development of the periodic table for chemistry, the discovery of the genetic code for genetics, or evolution in biology.
The Pacific Is Destined to Vanish as Earth's Continents Meld Into a New Supercontinent Science Alert - October 5, 2022>BR>
The Pacific Ocean's days are numbered, according to a new supercomputer simulation of Earth's ever-drifting tectonic plates. The good news? Our planet's oldest ocean still has another 300 million years to go. If the Pacific gets lucky, it might even celebrate its billionth birthday before finally trickling out of existence.
Wild New Paper Suggests Earth's Tectonic Activity Has an Unseen Source Science Alert - January 26, 2022
A newly published study looks to the skies for an explanation. Noting that force rather than heat is most commonly used to move large objects, the authors suggest that the interplay of gravitational forces from the Sun, Moon, and Earth could be responsible for the movement of Earth's tectonic plates.
Plate tectonics are 3.6 billion years old, oldest minerals on Earth reveal - zircon crystals Live Science - May 17, 2021
Earth's tectonic plates have moved continuously since they emerged a whopping 3.6 billion years ago, according to a new study on some of the world's oldest crystals. Previously, researchers thought that these plates formed anywhere from 3.5 billion to 3 billion years ago, and yet-to-be published research even estimated that the plates are 3.7 billion years old. The scientists on the new study discovered the onset date of plate tectonics by analyzing ancient zircon crystals from the Jack Hills in Western Australia. Some of the zircons date to 4.3 billion years ago, meaning they existed when Earth was a mere 200 million years old - a baby, geologically speaking. Researchers used these zircons, as well as younger ones dating to 3 billion years ago, to decipher the planet's ongoing chemical record.
Earth's oldest minerals date onset of plate tectonics to 3.6 billion years ago PhysOrg - May 15, 2021
Earth is the only planet known to host complex life and that ability is partly predicated on another feature that makes the planet unique: plate tectonics. No other planetary bodies known to science have Earth's dynamic crust, which is split into continental plates that move, fracture and collide with each other over eons. Plate tectonics afford a connection between the chemical reactor of Earth's interior and its surface that has engineered the habitable planet people enjoy today, from the oxygen in the atmosphere to the concentrations of climate-regulating carbon dioxide. But when and how plate tectonics got started has remained mysterious, buried beneath billions of years of geologic time.
Watch a Billion Years of Shifting Tectonic Plates in 40 Mesmerizing Seconds Science Alert - February 9, 2021
The tectonic plates that cover Earth like a jigsaw puzzle move about as fast as our fingernails grow, but over the course of a billion years that's enough to travel across the entire planet – as a fascinating new video shows.
I always pay attention to the Mid-Atlantic Ridge as a precursor for end times. Most people follow increasing earthquake activity in the Pacific as well as the recently split Indian Ocean Plate but I live on the Atlantic seaboard and this is what rings true for me. The bottom line is all of the tectonic plates are broken so it's just a matter of time until the first 'domino' falls as the others follow suit.
The Atlantic Ocean is widening. Here's why. Live Science - January 28, 2021
Live Science - January 39, 2021
The Atlantic Ocean is getting wider, shoving the Americas to one side and Europe and Africa to the other. But it's not known exactly how. A new study suggests that deep beneath the Earth's crust, in a layer called the mantle, sizzling-hot rocks are rising up and pushing on tectonic plates - those rocky jigsaw pieces that form Earth's crust - that meet beneath the Atlantic. Previously, scientists thought that the continents were mostly being pulled apart as the plates beneath the ocean moved in opposite directions and crashed into other plates, folding under the force of gravity. But the new study suggests that's not the whole picture. The research began in 2016, when a group of researchers set sail on a research vessel to the widest part of the Atlantic Ocean between South America and Africa; in other words, to the middle of nowhere.
'Lost' tectonic plate called Resurrection hidden under the Pacific Live Science - October 22, 2020
Scientists have reconstructed a long-lost tectonic plate that may have given rise to an arc of volcanoes in the Pacific Ocean 60 million years ago. The plate, dubbed Resurrection, has long been controversial among geophysicists, as some believe it never existed. But the new reconstruction puts the edge of the rocky plate along a line of known ancient volcanoes, suggesting that it was once part of the crust (Earth's top layer) in what is today northern Canada.
A new idea on how Earth's outer shell first broke into tectonic plates PhysOrg - July 20, 2020
The activity of the solid Earth - for example, volcanoes in Java, earthquakes in Japan, etc. - is well understood within the context of the ~50-year-old theory of plate tectonics. This theory posits that Earth's outer shell (Earth's "lithosphere") is subdivided into plates that move relative to each other, concentrating most activity along the boundaries between plates. It may be surprising, then, that the scientific community has no firm concept on how plate tectonics got started.
The African continent is very slowly peeling apart. Scientists say a new ocean is being born NBC - July 19, 2020
In one of the hottest places on Earth, along an arid stretch of East Africa's Afar region, it's possible to stand on the exact spot where, deep underground, the continent is splitting apart. This desolate expanse sits atop the juncture of three tectonic plates that are very slowly peeling away from each other, a complex geological process that scientists say will eventually cleave Africa in two and create a new ocean basin millions of years from now. For now, the most obvious evidence is a 35-mile-long crack in the Ethiopian desert.
Plate tectonics research rewrites history of Earth's continents PhysOrg - July 8, 2020
New evidence to suggest that the Earth's first continents were not formed by subduction in a modern-like plate tectonics environment as previously thought, and instead may have been created by an entirely different process.
Maps reveal new details about New Zealand's lost underwater continent CNN - June 23, 2020
Under New Zealand, there lies a vast continent on the sea floor. Once part of the same land mass as Antarctica and Australia, the lost continent of Zealandia broke off 85 million years ago and eventually sank below the ocean, where it stayed largely hidden for centuries. Now, maps reveal new research about the underwater continent where dinosaurs once roamed - and allow the public to virtually explore it. GNS Science, a New Zealand research institute, published two new maps and an interactive website on Monday. The maps cover the shape of the ocean floor and Zealandia's tectonic profile, which collectively help tell the story of the continent's origins.
Giant tectonic plate under Indian Ocean is breaking in two Live Science - May 22, 2020
In a short time (geologically speaking) this plate will split in two, a new study finds.
How the Earth's last supercontinent broke apart to form the world we have today BBC - May 14, 2020
Pangaea was the Earth's latest supercontinent—a vast amalgamation of all the major landmasses. Before Pangaea began to disintegrate, what we know today as Nova Scotia was attached to what seems like an unlikely neighbor: Morocco. Newfoundland was attached to Ireland and Portugal.
The lost continent of Zealandia hides clues to the Ring of Fire's birth Live Science - February 11, 2020
The hidden undersea continent of Zealandia underwent an upheaval at the time of the birth of the Pacific Ring of Fire. Zealandia is a chunk of continental crust next door to Australia. It's almost entirely beneath the ocean, with the exception of a few protrusions, like New Zealand and New Caledonia. But despite its undersea status, Zealandia is not made of magnesium- and iron-rich oceanic crust. Instead, it is composed of less-dense continental crust. The existence of this odd geology has been known since the 1970s, but only more recently has Zealandia been more closely explored. In 2017, geoscientists reported in the journal GSA Today that Zealandia qualifies as a continent in its own right, thanks to its structure and its clear separation from the Australian continent.
We Could Be Witnessing the Death of a Tectonic Plate, Says Earth Scientist Live Science - August 7, 2019
A gaping hole in a dying tectonic plate beneath the ocean along the West Coast of the United States may be wreaking havoc at Earth's surface, but not in a way most people might expect. This gash is so big it may trigger earthquakes off the coast of Northern California and could explain why central Oregon has volcanoes, a new study found. The researchers in the new study aren't the first to suggest that the Michigan-size Juan de Fuca (pronounced "wahn de fyoo-kuh") plate has a tear. But thanks to a new, detailed dataset, they're the first to say so with certainty.
Plate tectonics that control the movement of the continents and cause earthquakes first formed 2.5 billion years ago, scientists claim Daily Mail - August 7, 2019
Plate tectonics, the gradual drift of continents across the Earth's surface that causes earthquake, began around 2.5 billion years ago, a new study suggests. Exactly when the Earth's plates formed and began moving has long been a subject of debate, with estimates ranging from 3.5–5 billion years ago. Researchers studied metamorphic rocks from across the globe to build up a picture of how the heat flow in the Earth's crust has changed over time. From this they were able to determine when plate tectonics must have first begun.
A rocky relationship: A history of Earth's continents breaking up and getting back together PhysOrg - August 7, 2019
A new study of rocks that formed billions of years ago lends fresh insight into how Earth's plate tectonics, or the movement of large pieces of Earth's outer shell, evolved over the planet's 4.56-billion-year history. A report of the findings reveals that, contrary to previous studies that say plate tectonics has operated throughout Earth's history or that it emerged only 0.7 billion years ago, plate tectonics actually evolved over the last 2.5 billion years. This new timeline impacts researchers' models for understanding how Earth has changed.
A Tiny Magma Blob May Rewrite Earth's History of Plate Tectonics Live Science - August 7, 2019
A blob of magma entombed in a bubble smaller than the width of a human hair and found in South Africa may turn back the clock on Earth's first slow dance of the rocky slabs that make up its outer shell. The chemicals inside that little blob suggest so-called plate tectonics revved up during the first billion years of Earth's existence. Since the 1950s, scientists have known Earth's crust is made of giant slabs called tectonic plates that float above Earth's molten mantle. These colossal plates meet in subduction zones, where the lighter slab slides under the heavier one into the depths of the mantle. The sinking crust, infused with minerals collected from Earth's surface, melts into magma under the extreme pressures and temperatures of Earth's interior
Did plate tectonics set the stage for life on Earth? PhysOrg - June 7, 2018
A new study suggests that rapid cooling within the Earth's mantle through plate tectonics played a major role in the development of the first life forms, which in turn led to the oxygenation of the Earth's atmosphere. Scientists found that over the 4.5 billion years of the Earth's development, rocks rich in phosphorus accumulated in the Earth's crust. They then looked at the relationship of this accumulation with that of oxygen in the atmosphere.
Geoscientists suggest 'snowball Earth' resulted from plate tectonics PhysOrg - May 7, 2018
About 700 million years ago, the Earth experienced unusual episodes of global cooling that geologists refer to as "Snowball Earth." Several theories have been proposed to explain what triggered this dramatic cool down, which occurred during a geological era called the Neoproterozoic. Now geologists suggest that those major climate changes can be linked to one thing: the advent of plate tectonics. Plate tectonics is a theory formulated in the late 1960s that states the Earth's crust and upper mantle - a layer called the lithosphere - is broken into moving pieces, or plates. These plates move very slowly - about as fast as your fingernails and hair grow - causing earthquakes, mountain ranges and volcanoes.
Big crack is evidence that East Africa could be splitting in two CNN - April 5, 2018
A large crack, stretching several kilometres, made a sudden appearance recently in south-western Kenya. The tear, which continues to grow, caused part of the Nairobi-Narok highway to collapse and was accompanied by seismic activity in the area. The Earth is an ever-changing planet, even though in some respects change might be almost unnoticeable to us. Plate tectonics is a good example of this. But every now and again something dramatic happens and leads to renewed questions about the African continent splitting in two. The Earth's lithosphere (formed by the crust and the upper part of the mantle) is broken up into a number of tectonic plates. These plates are not static, but move relative to each other at varying speeds, "gliding" over a viscous asthenosphere.
1.7-Billion-Year-Old Chunk of North America Found Sticking to Australia Live Science - January 22, 2018
Geologists matching rocks from opposite sides of the globe have found that part of Australia was once attached to North America 1.7 billion years ago. Researchers from Curtin University in Australia examined rocks from the Georgetown region of northern Queensland. The rocks - sandstone sedimentary rocks that formed in a shallow sea - had signatures that were unknown in Australia but strongly resembled rocks that can be seen in present-day Canada. The researchers, who described their findings online Jan. 17 in the journal Geology, concluded that the Georgetown area broke away from North America 1.7 billion years ago. Then, 100 million years later, this landmass collided with what is now northern Australia, at the Mount Isa region.
Study bolsters theory of heat source under Antarctica PhysOrg - November 8, 2017
A new NASA study adds evidence that a geothermal heat source called a mantle plume lies deep below Antarctica's Marie Byrd Land, explaining some of the melting that creates lakes and rivers under the ice sheet. Although the heat source isn't a new or increasing threat to the West Antarctic ice sheet, it may help explain why the ice sheet collapsed rapidly in an earlier era of rapid climate change, and why it is so unstable today.
Earth's tectonic plates are weaker than once thought PhysOrg - October 3, 2017
No one can travel inside the earth to study what happens there. So scientists must do their best to replicate real-world conditions inside the lab.
Analysis of titanium in ancient rocks creates upheaval in history of early Earth PhysOrg - September 22, 2017
The Earth's history is written in its elements, but as the tectonic plates slip and slide over and under each other over time, they muddy that evidence - and with it the secrets of why Earth can sustain life.
Tectonic plates 'weaker than previously thought,' say scientists PhysOrg - September 14, 2017
Experiments carried out at Oxford University have revealed that tectonic plates are weaker than previously thought. The finding explains an ambiguity in lab work that led scientists to believe these rocks were much stronger than they appeared to be in the natural world. This new knowledge will help us understand how tectonic plates can break to form new boundaries.
Space view of Earth's magnetic rocks BBC - March 21, 2017
It is the best depiction yet of the magnetism retained in Earth's rocks, as viewed from space. The map was constructed using data from Europe's current Swarm mission, combined with legacy information from a forerunner satellite called Champ. Variations as small as 250km across are detectable. Clearly seen are the "stripes" of magnetism moving away from mid-ocean ridges - the places on the planet where new crust is constantly produced. This pattern - the consequence of periodic changes in Earth's polarity being locked into the minerals of cooling volcanic rock - was one of the key pieces of evidence for the theory of plate tectonics.
Release of water shakes Pacific Plate at depth PhysOrg - January 11, 2017
Tonga is a seismologists' paradise, and not just because of the white-sand beaches. The subduction zone off the east coast of the archipelago racks up more intermediate-depth and deep earthquakes than any other subduction zone, where one plate of Earth's lithosphere dives under another, on the planet. Tonga is such an extreme place, and that makes it very revealing. That swarm of earthquakes is catnip for seismologists because they still don't understand what causes earthquakes to pop off at such great depths.
New Seafloor Map Reveals Secrets of Ancient Continents' Shoving Match Live Science - January 20, 2016
Tectonic plates may have inched across the Earth’s surface to where they are now over the course of billions of years, but they left behind traces of this movement in bumps and gashes under the sea. Now, a new topographic map of the seafloor has helped researchers chronicle when the Indian-Eurasian continent formed as well as find a previously undiscovered microplate that broke off as a result of the event. NASA’s Earth Observatory released the map on Jan. 13, and it reveals the complex topography of the planet’s seafloor. By analyzing these underwater peaks and ridges, researchers can decipher how and when the plates that made up the ancient supercontinent Pangaea tore apart about 200 million years ago, resulting in the birth of new ocean crust and the formation of mountain ranges. The map, which is bright blue and red like a heat map, was compiled by an international team of researchers using a gravity model of the ocean, which is in turn based on altimetry data from the CryoSat-2 and Jason-1 satellites.
Continents Rose Above Oceans 3 Billion Years Ago Live Science - June 27, 2015
The continents may have first risen high above the oceans of the world about 3 billion years ago, researchers say. That's about a billion years earlier than geoscientists had suspected for the emergence of a good chunk of the continents. Earth is the only known planet whose surface is divided into continents and oceans. Currently, the continents rise an average of about 2.5 miles (4 kilometers) above the seafloor. The continents are composed of a thick, buoyant crust that's about 21 miles (35 km) deep, on average, whereas the comparatively thin, dense crust of the ocean floor is only an average of about 4 miles (7 km) thick. Because the continents are so thick and buoyant, they are less likely to get dragged downward. That's why so many ancient continental rocks have survived in the Earth's crust. Still, much about the earliest days of continents, and when and how they formed, remains hotly contested.
Uplifted island PhysOrg - June 22, 2015
The island Isla Santa María in the south of central Chile is the document of a complete seismic cycle. At the South American west coastline the Pacific Ocean floor moves under the South American continent. Resulting that through an in- and decrease of tension the earth's crust along the whole continent from Tierra del Fuego to Peru broke alongside the entire distance in series of earthquakes within one and a half century. The earthquake of 1835 was the beginning of such a seismic cycle in this area. After examining the results of the Maule earthquake in 2010 a team for the first time were able to measure and simulate a complete seismic cycle at its vertical movement of the earth's crust at this place.
North American plate shattered speed records a billion years ago PhysOrg - February 4, 2015
A new study led by Michigan Technological University geophysicist Aleksey Smirnov reveals that 1.1 billion years ago, the North American tectonic plate scooted along at a blistering 24.6 centimeters - about 10 inches - per year. While it may not seem to be shattering any speed records, that's twice as fast as continental plates typically traveled in their wanderings over the earth's surface back in Precambrian times. Oceanic plates moved that quickly, but they are also much thinner, only 10 to 15 kilometers deep. Continental plates are up to 70 kilometers (43 miles) thick. These days, tectonic plates - 15-20 huge, interlocking pieces that make up the earth's crust - are even slower. Nevertheless, their movements are partially responsible for geological phenomena like earthquakes, volcanoes and mountain building.
Breakup of ancient supercontinent Pangea hints at future fate of Atlantic Ocean PhysOrg - December 1, 2014
Pangea, the supercontinent that contained most of the Earth's landmass until about 180 million years ago, endured an apocalyptic undoing during the Jurassic period, when the Atlantic Ocean opened up. This is well understood. But what is less clear is how Pangea came into being in the first place.
Tectonic plates not rigid, deform horizontally in cooling process Science Daily - November 5, 2014
The puzzle pieces of tectonic plates are not rigid and don't fit together as nicely as we were taught in high school. A new study quantifies deformation of the Pacific plate and challenges the central approximation of the plate tectonic paradigm that plates are rigid. Oceanic tectonic plates deform due to cooling, causing shortening of the plates and mid-plate seismicity.
Pacific plate shrinking as it cools Science Daily - August 28, 2014
The Pacific tectonic plate is not as rigid as scientists believe, according to new calculations. Scientists have determined that cooling of the lithosphere -- the outermost layer of Earth -- makes some sections of the Pacific plate contract horizontally at faster rates than others and cause the plate to deform. The tectonic plates that cover Earth's surface, including both land and seafloor, are in constant motion; they imperceptibly surf the viscous mantle below. Over time, the plates scrape against and collide into each other, forming mountains, trenches and other geological features. The new calculations showed the Pacific plate is pulling away from the North American plate a little more -- approximately 2 millimeters a year -- than the rigid-plate theory would account for, he said. Overall, the plate is moving northwest about 50 millimeters a year.
From Drip to Glide: How Plate Tectonics Started Live Science - April 7, 2014
A cold, crusty shell of a planet that regularly kills off its occupants with violent earthquakes and massive volcanic eruptions doesn't sound like ideal habitat. But Earth's grinding plates, the source of its deadly tectonics, are actually one of the key ingredients that make it only planet with life in the solar system (found so far). Now, a new model seeks to explain why Earth's plate tectonics is unique among the sun's rocky planets. It all comes down to tiny minerals in rocks.
New study reveals insights on plate tectonics PhysOrg - March 4, 2014
The Earth's outer layer is made up of a series of moving, interacting plates whose motion at the surface generates earthquakes, creates volcanoes and builds mountains. Geoscientists have long sought to understand the plates' fundamental properties and the mechanisms that cause them to move and drift, and the questions have become the subjects of lively debate.
Oldest Land-Living Animal from Gondwana Found Live Science - September 3, 2013
Early life was confined to the sea and the process of terrestrialization -- the movement of life onto land -- began during the Silurian Period roughly 420 million years ago. The first wave of life to move out from water onto land consisted of plants, which gradually increased in size and complexity throughout the Devonian Period. This initial colonization of land was closely followed by plant and debris-eating invertebrate animals such as primitive insects and millipedes. By the end of the Silurian period about 416 million years ago, predatory invertebrates such as scorpions and spiders were feeding on the earlier colonists of land.
Tectonic Plates' Patterns Revealed Live Science - August 13, 2013
The biggest jigsaw puzzle in the solar system has a split personality: The number and sizes of Earth's tectonic plates can flip, according to a new study. Today, the pieces of Earth's broken shell are unequal in size. Of about 50 plates, a mere seven account for 94 percent of the surface. The biggest, the Africa and the Pacific plates, are antipodal, meaning they sit on opposite sides of the Earth. But about 100 million years ago, the tectonic plates tiled the planet as evenly as a real-life jigsaw puzzle.
Gathering Gondwana: New Look at an Ancient Puzzle Live Science - July 5, 2013
Scientists are a step closer to solving part of a 165-million-year-old giant jigsaw puzzle: the breakup of the supercontinent Gondwana. Finding the past position of Earth's continents is a finicky task. But pinning down their wanderings plays a key role in everything from understanding ancient climate to how Earth's mountains and oceans evolved. Through "plate reconstruction" models, geoscientists illustrate how Earth's continents crunch together and split apart. Before it cracked into several landmasses, Gondwana included what are today Africa, South America, Australia, India and Antarctica. The big continents - Africa and South America - split off about 180 million to 170 million years ago. In recent years, researchers have debated what happened next, as the remaining continents rocketed apart. For example, different Gondwana reconstruction models had a 250-mile (400 kilometers) disagreement in the fit between Australia and Antarctica, an error that has a cascading effect in plate reconstructions, said Lloyd White, a geologist at Royal Holloway University in Surrey, England.
Why Is Africa Ripping Apart? Seismic Scan May Tell Live Science - June 19, 2013
Arrays of sensors stretching across more than 1,500 miles in Africa are now probing the giant crack in the Earth located there - a fissure linked with human evolution - to discover why and how continents get ripped apart. Over the course of millions of years, Earth's continents break up as they are slowly torn apart by the planet's tectonic forces. All the ocean basins on the Earth started as continental rifts, such as the Rio Grande rift in North America and Asia's Baikal rift in Siberia. The giant rift in Eastern Africa was born when Arabia and Africa began pulling away from each other about 26 million to 29 million years ago. Although this rift has grown less than 1 inch (2.54 centimeters) per year, the dramatic results include the formation and ongoing spread of the Red Sea, as well as the East African Rift Valley, the landscape that might have been home to the first humans.
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