21 terms

Earth Science - Plate Tectonics


Terms in this set (...)

The thin and solid outermost layer of the Earth above the mantle.
The layer of rock between the Earth's crust and core.
The central part of the Earth below the mantle.
The solid, outer layer of the Earth that consists of the crust and the rigid upper part of the mantle.
The soft layer of the mantle on which the tectonic plates move.
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, outermost part of the mantle.
Seismic Waves
Vibrations created by an earthquake.
Machines that measure the times at which seismic waves arrive at different distances from an earthquake.
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's 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 that are moving away from each other.
Transform Boundary
The boundary between tectonic plates that are sliding past each other horizontally.
Stress that occurs when forces act to squeeze an object.
Stress that occurs when forces act to stretch an object.
The bending of rock layers due to stress.
A break in a body of rock along which one block slides relative to another.
The rising of regions of the Earth's crust to higher elevations.
The sinking of regions of the Earth's crust to lower elevations.

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