Inside the earth

Term Definition
Crust The outermost layer of the Earth is the crust.
Mantle The layer of rock between the crust and the core is the mantle.
Core The central part of the Earth below the mantle.
Lithosphere The outermost, rigid layer of the Earth.
Asthenosphere A plastic layer of the mantle on which the pieces of the lithosphere moves.
Mesosphere Beneath the asthenosphere is the strong, lower part of the mantle.
Tectonic plates A block of lithosphere that consist 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 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.
Convergent boundary The boundary formed by the collision of two lithosphere plates.
Divergent boundary The boundary 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 an object.
Folding The bending of rock layers due to stress.
Fault A break in a body o& rock along which one block slides relative to another.
Uplift The rising of regions of the eartha??s crust to higher elevations .
Subsidence The sinking of regions of the eartha??s crust to lower elevations.

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