Earthquakes

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Across
  1. 2. a very high, large wave in the ocean that is usually caused by an earthquake under the sea and that can cause great destruction when it reaches land
  2. 4. a large mass of rocks and earth that suddenly and quickly moves down the side of a mountain or hill
  3. 5. broken pieces of stone, brick, etc., from walls or buildings that have fallen
  4. 6. a device that measures and records the movement of the earth during an earthquake
  5. 8. tectonics a scientific theory that the Earth's surface is made of very large sections that move very slowly
Down
  1. 1. A hard layer on the surface of the earth
  2. 3. a number that shows the power of an earthquake
  3. 7. scale a system of measurement used for showing the strength of an earthquake