Ch.8 / Plate Tectonics Crossword

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Across
  1. 4. tiny particles of matter
  2. 6. molten material under Earth's surface
  3. 9. states that Earth's plates move slowly in various directions
  4. 12. what magma becomes when it reaches Earth's surface
  5. 13. piece of rock contained in another rock
  6. 14. lava that cools and hardens on a rock surface
  7. 15. the breaking down of rocks
  8. 16. subdivision of eras
  9. 17. half the time it takes for radioactive atoms to decay
  10. 18. organisms with scaly skin and lay tough, leathery eggs
  11. 19. an animal that lives of both land and water
Down
  1. 1. the three long units between Precambrian Time and now
  2. 2. series of processes that builds, destroys, and changes rocks
  3. 3. warm blooded vertebrate that feeds its young milk
  4. 5. break in Earth's crust
  5. 7. study of the structure of Earth and the forces that make and shape Earth
  6. 8. record of life forms and geologic events in Earth's history
  7. 10. the very slow movement of plates
  8. 11. magma that has pushed itself into rock that cooled and hardened
  9. 20. the pieces that make up Earth's outer layer