Rock types

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Across
  1. 2. important gas needed in soils
  2. 4. A black volcanic glass.
  3. 8. Needed for Metamorphic rocks to form
  4. 9. Rocks formed from magma
  5. 10. Common salt is sodium .......
  6. 13. The breaking down of rocks.
  7. 15. Floating extrusive igneous rock
  8. 17. Rocks formed from other rocks under heat and pressure
  9. 19. Sedimentary rock formed from sand
  10. 21. A river of ice
  11. 23. Type of sedimentary rock formed from rock fragments
  12. 24. A type of metamorphic rock formed from limestone
  13. 25. A natural"cement" in many sedimentary rocks
Down
  1. 1. Remains of creatures found in some sedimentary rocks
  2. 3. Chemical sedimentary rock found in Chillagoe
  3. 5. Type of metamorhism caused by close contact with hot magma
  4. 6. A pollutant gas that can cause acid rain is sulfur .......
  5. 7. Metamorphic rock formed from sandstone
  6. 11. Rocks formed from sediments
  7. 12. Hard mineral in Granite rock
  8. 14. Large crystalled igneous rock common in Herberton
  9. 16. Very hard gemstones formed from carbon
  10. 18. Dark volcanic rock common in Atherton
  11. 20. A metamorphic rock formed from shale
  12. 21. A banded metamorphic rock formed from granite
  13. 22. Tiny particles of sediment, holds water