This puzzle rocks

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