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Date Shared: 14 April 2018
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asthenosphere the lower layer of the crust compression an increase in the density of something conduction the transmission of heat or electricity or sound continent one of the large landmasses of the earth core the central part of the Earth crust the outer layer of the Earth earthquake vibration from underground movement along a fault plane fault a crack in the earth's crust resulting from displacement folding a geological process that causes a bend in a stratum of rock fracture a crack in the earth's crust Gondwanaland a hypothetical continent that (according to plate tectonic theory) broke up later into India and Australia and Africa and South America and Antarctica Laurasia a hypothetical continent that (according to plate tectonic theory) broke up later into North America and Europe and Asia lithosphere the part of the Earth consisting of the crust and mantle magma molten rock in the earth's crust mantle the layer of the earth between the crust and the core Pangaea (plate tectonics) a hypothetical continent including all the landmass of the earth prior to the Triassic period when it split into Laurasia and Gondwanaland plate a rigid layer of the Earth's crust plate tectonics branch of geology studying the earth's crust Richter scale a logarithmic scale of 1 to 10 formerly used to express the magnitude of an earthquake on the basis of the size of seismograph oscillations rift valley a valley with steep sides sedimentation the accumulation of matter deposited by some natural process seismograph an instrument for measuring movements of the ground subduction a geological process in which one edge of a crustal plate is forced sideways and downward into the mantle below another plate trench a long steep-sided depression in the ocean floor uplift lift up from the earth, as by geologic forces
14 April 2018
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