Natural phenomena

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Across
  1. 2. Hot, molten rock that comes out of a volcano
  2. 3. A very big storm usually over the ocean
  3. 4. Lightning, thunder, rain, wind, etc
  4. 7. When the ground shakes and buildings fall
  5. 9. Too much water at one time
  6. 10. A bright flash of electricity that comes before thunder
  7. 11. When there is a bad fire in nature
Down
  1. 1. A huge mountain that explodes - lava comes out
  2. 5. A very big wave that crashes onto the land
  3. 6. When the side of a mountain collapses and slides downhill
  4. 8. A violent column of spinning wind