The Changing Earth Crossword Puzzle

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Across
  1. 1. Rock changed by heat and pressure
  2. 6. The continuous process that changes rocks from one type to another
  3. 12. Hardened tree resin that can preserve insects
  4. 13. Small solid pieces that make up sedimentary rocks
  5. 14. A property describing how easily a mineral can be scratched
  6. 15. Rock formed when magma or lava cools
  7. 17. An Australian ore used to make aluminium
  8. 19. The complete history of life on Earth
  9. 21. The movement of broken rock by wind, water or ice
  10. 22. A fossil made when an organism leaves an impression in rock
  11. 23. A dating method that uses radioactive elements
  12. 24. The idea that older rock layers are found below younger ones
Down
  1. 2. The centre of the Earth, made mostly of iron and nickel
  2. 3. The layer of the Earth beneath the crust where convection currents occur
  3. 4. The thin outer layer of the Earth where we live
  4. 5. The breaking down of rocks without moving them
  5. 6. A method used to determine the age of fossils by comparing layers
  6. 7. A shiny or dull appearance of a mineral
  7. 8. Rock formed from layers of sediment
  8. 9. Preserved remains or traces of ancient life
  9. 10. A rock that contains enough valuable mineral to be mined
  10. 11. Visible repeating shapes found in minerals
  11. 16. The solid outer shell of the Earth made of the crust and upper mantle
  12. 18. The process where sediments are dropped or settled
  13. 20. A naturally occurring solid with a fixed chemical composition