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