Earthquakes and volcanoes

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Across
  1. 1. The start point of an earthquake.
  2. 3. _______ plates can cause volcanoes and earthquakes.
  3. 5. The man who explained the reaction series.
  4. 7. The name of molten rock while inside the ground.
  5. 8. The intensity scale for earthquakes.
Down
  1. 2. The instrument used to measure an earthquake's power.
  2. 4. Molten rock on earth's surface.
  3. 6. Earthquakes and volcanoes are both _______ disasters.