Puzzling Earth

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Across
  1. 3. using elemental decay to date objects
  2. 6. Meteor thats fallen to earth
  3. 10. Crust Destroyed
  4. 11. Layer of the earth shares a name with a atmosphere layer
  5. 13. This subject it's self
  6. 14. Generates Earths Magnetic Field.
  7. 15. Crust Created
  8. 17. Sea
  9. 18. measured with a seismograph
  10. 19. Solid Iron and Nickel
  11. 20. Bellow Lithosphere
Down
  1. 1. Movement of a median through difference in temperature
  2. 2. Uranium
  3. 4. Lead
  4. 5. has convection currents of magma in it
  5. 7. Crust and Upper Mantle
  6. 8. land
  7. 9. Crust neither made nor destroyed
  8. 12. emitted during radioactive decay
  9. 16. How Uranium turns into lead