Science crossword puzzle

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Across
  1. 2. American geologist
  2. 5. continuos system of twin mountain ranges with a Rift Valley between them that extends around earth on the seafloor
  3. 7. plates collide
  4. 8. largest fossilized seed ferm
  5. 9. opposed to a wider gully or ditch
  6. 10. sedimentary rock-forming process in which minerals precipitate out of water and fill the spaces between clasts
  7. 11. causes seafloor spreading
  8. 13. biggest smash-up on earth
  9. 15. dinosaur from 250 million years ago
  10. 16. solid with a predictable chemical composition and a characteristic set of physical properties
  11. 17. physical property of a mineral that measures resistance to scratching
Down
  1. 1. describes the size and arrangement of rock components and can help indicate how a rock formed
  2. 3. forced while molten into cracks between layers of rocks
  3. 4. plates are moving apart
  4. 5. molten rock material found inside earth
  5. 6. physical property of a mineral that causes it to break into uneven pieces
  6. 12. German scientist
  7. 14. flat planes when exposed to stress when being hit with hammer