This Puzzle Rocks

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Across
  1. 5. a course grain igneous rock
  2. 6. rocks are made up of these
  3. 8. a force that increases as you go deeper underground
  4. 10. like metal
  5. 12. the layer of the earth just below the crust
  6. 15. a word that describes how hard something is
  7. 17. the second layer from the centre of the earth
  8. 19. has a mohs hardness scale of 7
  9. 20. the process by which sediment is moved
  10. 21. this describes how reflective a rock is
  11. 23. a type of rock used to make buildings and sculptures
  12. 25. you are most likely to find fossils in this type of rock
  13. 26. the science of studying the earth
  14. 27. glassy volcanic rock
Down
  1. 1. the very centre of the earth
  2. 2. the rock formed by the solidification of lava
  3. 3. this is how rocks are broken down is size
  4. 4. extrusive igneous rock has small one of these
  5. 6. molten rock that is still underground
  6. 7. the layer of the earth on which we live
  7. 9. a physical quantity that expresses hot and cold
  8. 11. The Rock __________
  9. 13. the planet on which we live
  10. 14. to change into another form
  11. 16. a word used to describe how big something is
  12. 18. you need intense heat and pressure to form this type of rock
  13. 21. molten rock
  14. 22. you get these when you scratch a rock sample on a unglazed tile
  15. 24. the building blocks of sedimentary rock