Oceanic lithosphere is the rigid outer shell of Earth underlying ocean basins, comprising oceanic crust and the uppermost mantle, mechanically coupled and behaving as a coherent tectonic plate segment. It forms at mid-ocean ridges through decompression melting of the mantle, producing basaltic crust overlying a lithospheric mantle that cools, thickens, and increases in density with age and distance from the ridge. Its thermal and mechanical structure controls plate flexure, isostasy, and patterns of seismicity, and it ultimately returns to the mantle at subduction zones, playing a central role in plate tectonics, mantle convection, and global geochemical cycling.
The history of Earth is written on the great tablets of tectonic plates. The motions of plates shaped land masses, formed oceans, and created the varied climates and habitats that set the stage for evolution and the diversity ...
Earth Sciences
Mar 19, 2026
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The Cascadia Subduction Zone is unusually quiet for a megathrust fault. Spanning more than 600 miles from Canada to California, the fault marks the convergence of the Juan de Fuca and North American plates. While other subduction ...
Earth Sciences
Feb 27, 2026
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When the supercontinent Pangea began to fragment around 200 million years ago during the Early Jurassic, it reshaped the face of the planet. Vast new oceans opened, continents drifted apart and the familiar geography of today ...
About 56 million years ago, Europe and North America began pulling apart to form what became the ever-expanding North Atlantic Ocean. Vast amounts of molten rock from Earth's mantle reached the ocean floor as the crust stretched ...
Earth Sciences
Feb 18, 2026
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The King's Trough Complex is a several-hundred-kilometer-long, canyon-like system of trenches on the North Atlantic seafloor. Its formation was long thought to be the result of simple stretching of the oceanic crust. An international ...
Earth Sciences
Jan 29, 2026
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A team of scientists announced Tuesday they have developed new deep-sea landers specifically to test their contentious discovery that metallic rocks at the bottom of the ocean are producing "dark oxygen".
Earth Sciences
Jan 20, 2026
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Earth scientists have discovered how continents are slowly peeled from beneath, fueling volcanic activity in an unexpected place: the oceans.
Earth Sciences
Nov 11, 2025
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An international research collaboration has harnessed supercomputing power to better understand how massive slabs of ancient ocean floors are shaped as they sink hundreds of kilometers below Earth's surface.
Earth Sciences
Oct 3, 2025
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Off the southern coast of Chile, three tectonic plates meet at a point known as the Chile Triple Junction. Two are oceanic plates, the Nazca and the Antarctic, which are separating in an active spreading center, creating ...
Earth Sciences
Aug 18, 2025
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Hydrogen-producing hydrothermal systems in the deep ocean are rare but critical to understanding Earth's internal processes and the conditions that may have fostered life's origins. Now scientists from the Institute of Oceanology ...
Earth Sciences
Aug 12, 2025
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