Across
- 7. Type of rock that has been for on the earth for a million years
- 10. One of three main types of sedimentary
- 12. Something that is in a rock
- 14. Apart of sedimentary and good to use for paving
- 17. Hardest rock in the world
- 18. Very soft rock and used for microscopes
Down
- 1. Word that sums up all of the 3 main types
- 2. It is aprat of the sedimentary rock and creates rocks
- 3. It become a metamorphic rock
- 4. Also three types of sedimentary
- 5. Type of rock that is still formed on earth today
- 6. Rocks that are formed outside
- 8. It is very light
- 9. Used for building and tiles
- 11. Type of formation of a rock
- 13. Very hot and is magma
- 15. Its good for building
- 16. A very important substance to forming a rock