Earthquakes, volcanoes, and tsunamis

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Across
  1. 2. The outer layer of the Earth.
  2. 5. Melted rock that flows from a volcano.
  3. 8. A tool that records movements in the Earth.
  4. 9. Tiny bits of rock from a volcano.
  5. 10. A mountain that can erupt with lava.
  6. 11. A slide of wet earth down a slope.
  7. 12. A narrow opening in the ground.
Down
  1. 1. When the ground suddenly shakes.
  2. 3. To move back and forth quickly.
  3. 4. Rocks and earth falling down a hill.
  4. 6. Hot, melted rock inside the Earth.
  5. 7. A giant sea wave caused by an underwater earthquake.