21 terms

Earth Science - Plate Tectonics

STUDY
PLAY

Terms in this set (...)

Crust
The thin and solid outermost layer of the Earth above the mantle.
Mantle
The layer of rock between the Earth's crust and core.
Core
The central part of the Earth below the mantle.
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, outermost part of the mantle.
Seismic Waves
Vibrations created by an earthquake.
Seismographs
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.
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 of rock along which one block slides relative to another.
Uplift
The rising of regions of the Earth's crust to higher elevations.
Subsidence
The sinking of regions of the Earth's crust to lower elevations.

Flickr Creative Commons Images

Some images used in this set are licensed under the Creative Commons through Flickr.com.
Click to see the original works with their full license.