Journey to the Centre of the Earth

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Across
  1. 1. to break suddenly with a big noise
  2. 8. people say things with this
  3. 9. where water falls down over rocks
  4. 13. we walk on this
  5. 14. powder that explodes
  6. 16. the light in the sky when there is a storm
  7. 17. a big white or grey thing that rain comes from
Down
  1. 2. the hot liquid that comes out when a volcano erupts
  2. 3. there are 26 of them in the English alphabet
  3. 4. to break into smaller pieces
  4. 5. a type of elephant from five million years ago
  5. 6. a sharp tool used for cutting something
  6. 7. a person who does something good or important
  7. 10. a very big stone
  8. 11. the part of the Earth that is not the sea
  9. 12. people live in lots of different countries on this
  10. 15. to give fire to something