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the solid, outer layer of the Earth that consists of the crust and the rigid upper part of the mantle.
the soft layer of the mantle on which the tectonic plates move. Convection currents occur in this layer.
a block of lithosphere that consist of the crust and the ridgid, outer most part of the mantle.
the hypothesis that states that the continents once formed a single landmass, broke up, and drifted to the present locations.
the process by which new oceanic lithosphere forms as magma rises toward the surface and solidifies.
the theory that explains how large pieces of the Earth's outer most layer called " tectonics plates" move and change shape.
the boundary between tectonic plates that are sliding past each other horizontally.
stress that occurs when forces act or squeeze an object. Compression happens at convergent boundaries.
stress that occurs when forces act to stretch a boundary. This happens at divergent boundaries.
the region where an oceanic plate sinks down into the asthenosphere at a convergent boundary, usually between continental and oceanic plates
The process that creates new sea floor as plates move away from each other at the mid-ocean ridges
an undersea mountain chain where new ocean floor is produced; a divergent plate boundary. This is the longest mountain chain in the world.
the liquid layer of the Earth's core that lies beneath the mantle and surrounds the inner core
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