Across
- 3. molten rock that reaches the earth's surface
- 4. formed by heat and pressure
- 9. minerals in rock dissolved by mixing with acid
- 10. formed from cooling and crystallisation of molten rock
- 11. molten rock that remains below the earth's surface
- 14. formed from sediments being compacted and cemented
- 16. wind or water cause rocks to collide and grind against each other
- 18. breakdown of rock by oxygen
- 19. trample and burrow rocks
- 20. physical, chemical or biological process that breaks down rocks into smaller pieces
- 21. minerals that make up rock change into new substance
Down
- 1. increase in temp cause rocks expand decrease in temp cause rocks to contract
- 2. sediments are laid down on the ground
- 5. rocks broken down by change in temp of rocks
- 6. squeezed and pressured by layers of other rocks
- 7. broken down pieces of rock
- 8. water continually seeping into cracks then freezing and expanding
- 12. grow through joints or cracks in rocks to find moisture
- 13. when rocks are glued together
- 15. moved by water or wind
- 17. cause by activities of living organisms