Inside the earth

Term Definition
Crust The crust is 5 to 100 km thick.
Mantle The mantle is much thicker than the crust and contains most of the earths mass.
Core Scientists are think that the earths core is made mostly of iron and contains smaller amounts of nickel but almost no oxygen, silicon, aluminum, or magnesium.
Lithosphere The lithosphere is mad of two parts the crust and the rigid upper part of the mantle.
Asthenosphere
Is a plastic layer of the mantle on which pieces of the lithosphere move.
Mesosphere The mesosphere extends from the bottom of the asthenosphere tho the Eartha??s core.
Tectonic plate 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 towards 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 two lithosphere plates.
Convergent boundary The boundary between two tectonic plates that are moving away from each other.
Divergent boundary The boundary between two tectonic plates that are moving away 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 and 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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