Inside the Earth

Crust 5 to 100 kilometers. Is the eartha??s thinnest layer.
Is much thicker than the crust and contains most of the eartha??s mass.
Core Makes up roughly 1/3 the eartha??s mass. Made of solid nickel and iron.
Lithosphere Divided into tectonic plates.
Asthenosphere The soft layer of the mantle on which the tectonic plates move.
Mesosphere The strong, lower part of the mantle.
Tectonic plates A block of lithosphere.
Continental drift The hypotheses that states that the continents once formed a single landmass, broke up, and drifted to their present location.
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 the outermost layer, called tectonic plates, move and change shape.
Convergent boundary The boundary formed by the collision of two lithospheric plates.
Divergent boundary The boundary between two tectonic plates moving away from each other.
Transform boundary The boundary tectonic plates that are sliding past each other horizontally.
Compression Stress that occurs when forces act to squeeze an object.
Tension Stress that occur when forces act to stretch an 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 eartha??s crust to higher elevations.
Subsidence The sinking of regions of the eartha??s crust to lower elevations.

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