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Unit 2 Vocab Science

Earth Space Science CH 10,12,14,4

TermDefinition
Seismic waves Vibrations that travel through Earth and are caused by events like earthquakes or human-made blasts.
Seismologist A scientist who detects and interprets seismic waves.
Disturbance A movement that begins in one location and sets things in motion farther away.
P-waves (primary) Seismic waves that move with a forward-and-backward motion; these waves are faster than S-waves and travel through solids and liquids.
S-waves (shear) Seismic waves that move with a side-to-side motion, are slower than P-waves, and only travel through solids.
Crust The outermost layer of the Earth.
Mantle The hot, flowing, solid layer of the Earth between the crust and the core.
Lithosphere A layer of Earth that includes the crust and the upper mantle.
Asthenosphere The lower part of the upper mantle; lithospheric plates slide on this layer.
Core It is divided into the inner core and the outer core.
Foreshock A small burst of shaking that occurs before a large earthquake.
Aftershock A small tremor that follows an earthquake.
Earthquake The movement of Earth’s crust resulting from the release of built-up potential energy between two stuck lithospheric plates.
Focus The point below Earth’s surface where a rock breaks or slips and causes an earthquake.
Fault A region on Earth’s surface that is broken and where movement occurs.
Epicenter A point on Earth’s surface right above the focus of an earthquake.
Seismograph an instrument that measures and records seismic waves.
Body waves Seismic waves that travel through the interior of Earth.
Surface waves Seismic waves that reach and travel along Earth’s surface. Richter scale - a scale that ranks earthquakes according to the size of the seismic waves.
Created by: tgarcia573
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