Inside the earth

Term Definition
Crust The thin and solid outermost layer of earth above the mantle.
Mantle Q
Mantle The layers of rock between the earth crust and core.
Core The Central Part of the earth below the mantle.
Lithosphere The soil outer layer of the earth that consists of the crust.
Asthenosphere The soft layer of the mantle on which the tectonic plates move.
Mesosphere the strong lower part of the mantle between the asthenoshere and the outer core.
Tectonic plate A block of lithosphere that consists of the crust and the rigid outermost part of the mantle.
Continental drift
That hypocrisy 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 forms as magma rises toward the surface and solidifies .
Plate tectonics The theory that explains how large pieces of the earth outermost layer called tectonic plates move and change shape.
Convergent boundary
The boundary formed by the collision of two lithosphere plates
Divergent boundary The boundary b between two tectonic plates that are moving away from each other
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
Tension Stress that occurs when forces act to stretch a. Object
Folding The bending of rock layers due to stress
Fault A break in a body of rock along which one block slides relative to another
Uplift The rising of regions of the earth crust to higher elevations
Subsidence

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