Week 18 Vocabulary
1) Earthquake shaking and vibration at the surface of the earth resulting from underground movement along a fault plane or from volcanic activity.
2) Focus the source of the earthquake inside the earth, where the rock first begins to break.
3) Epicenter point of Earth's surface directly above an earthquake's focus.
4) Fault a break in the rocks of the earth's crust along which movement may occur, causing earthquakes.
5) Seismic Wave a wave that travels outward from the site of an earthquake through the earth.
6) Seismograph a scientific instrument that detects and records vibrations (seismic waves) produced by earthquakes.
7) Magnitude a measure of the strength of an earthquake.
8) Richter Scale the scale used by scientists to measure the intensity of an earthquake
9) Primary Wave a push-pull seismic wave that can travel through solids, liquids, and gases; these waves are the fastest type of seismic wave.
10) Secondary Wave An earthquake wave that moves side to side that can move through solids but not through liquids or gases, S waves are slower that P waves, but faster than L (surface) waves.



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