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Lithosphere
The outermost layer of the Earth, comprising the crust and the uppermost part of the mantle, which is rigid and brittle.
Abyssal Plain
Large, flat areas of the deep ocean floor, situated between continental margins and mid-ocean ridges, covered with fine sediment.
Mid-Ocean Ridge
An underwater mountain range formed by plate tectonics, characterized by volcanic activity and new seafloor formation.
Isostasy
A principle stating that the Earth's crust is in gravitational equilibrium, where areas of thicker or denser crust sink deeper into the mantle, and areas of thinner crust rise.
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