19 terms

Tectonic Plates

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asthenosphere
the soft layer of the mantle on which the tectonic plates move
core
the central part of the Earth below the mantle
crust
the thin and solid outermost layer of the Earth above the mantle
lithosphere
the solid, outer layer of Earth that consists of the crust and the rigid upper part of the mantle
mantle
the layer of rock between the Earth's crust and core
mesosphere
the strong, lower part of the mantle between the asthenosphere and the outer core
tectonic plates
a block of lithosphere that consists of the crust and the rigid, outermost part of the mantle
continental drift
the hypothesis that states that the continents once formed a single landmass, broke up, and drifted to their present locations
sea-floor spreading
the process by which new oceanic lithosphere (sea floor) forms as magma rises to Earth's surface and solidifies at a mid-ocean ridge
convergent boundary
the boundary between tectonic plates that are colliding
divergent boundary
the boundary between two tectonic plates that are moving away from each other
plate tectonics
the theory that explains howlarge pieces of the Earth's outermost layer,called tectonic plates, move and change shape
transform boundary
the boundary between tectonic plates that are sliding past each other horizontally
compression
stress that occurs when forces act to squeeze an object
fault
a break in a body of rock along which one block slides relative to another
folding
the bending of rock layers due to stress
subsidence
the sinking of regions of the Earth's crust to lower elevations
tension
stress that occurs when forces act to stretch an object
uplift
the rising of regions of the Earth's crust to higher elevations