Earthquakes

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Across
  1. 4. A device that records details of earthquakes
  2. 5. a term for the size or extent of something
  3. 7. smaller earthquake that precedes a larger one
  4. 9. series of extremely long waves caused by a large and sudden displacement of a body of water
Down
  1. 1. the point on the earth's surface vertically above the focus of an earthquake.
  2. 2. The theory of Earth's outer layer broken into large pieces
  3. 3. environment that degrades it from its initial state
  4. 6. smaller earthquake following the main shock of a large earthquake.
  5. 7. Earth's crust along which blocks of rock have moved relative to one another
  6. 8. Vibrations that travel through the Earth's layers