2.4 Earth Science
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orogeny
natural mountain building
mass movement
the downhill movement of rock and soil because of gravity
isostasy
the equilibrium between continental crust and the denser mantle below it
seismometer
Instrument used to measure horizontal or vertical motion during an earthquake.
magnitude
Measure of the energy released during an earthquake
epicenter
Point on Earth's surface directly above an earthquake's focus
erosion
Processes by which rock, sand, and soil are broken down and carried away
weathering
The breaking down of rocks and other materials on the Earth's surface.