Inside The Earth

Term Definition
Crust The outermost layer of the earth.
Mantle The layer of the earth between crust and the core is the mantle
Core The layer of the earth that extends from below the mantle to the center of the earth is the Core.
Lithosphere The solid, outer layer of the earth that consists of the crust and the rigid upper part of the mantle.
Asthenosphere The soft layer of the mantle on which the tectonic plates move.
Mesosphere The strong, lower part of the mantle between the asthenosphere and the outer core
Tectonic plate A block of lithosphere that consists of the crust and the rigid, outmost 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 eartha??s 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 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 which one block slides relative to another
Uplift The rising of regions of the eartha??s crust to lower elevations
Subsidence The sinking of regions of the eartha??s crust to lower elevations

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