Puzzling Earth

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Across
  1. 2. Rigid outer part of Earth; physical layer
  2. 5. Second layer of earth
  3. 6. Where convection happens in earth
  4. 9. The original isotope
  5. 10. The second isotope
  6. 13. very inside of Earth
  7. 14. When plates converge; makes mountains
  8. 15. when plates slide against eachother
  9. 17. part of mantle, flows like molten plastic, still solid
  10. 19. the third and coldest layer of Earth's atmosphere
  11. 20. Thicker, older crust; basalt
Down
  1. 1. When you date something based off it's radiation
  2. 3. waves made by earthquakes or explosions
  3. 4. Thinner, younger crust; granite
  4. 7. a space rock that has entered the atmosphere
  5. 8. Emission of energy as ionizing radiation
  6. 11. The "plates" that continents float on
  7. 12. When plates move away from each other; makes valleys
  8. 16. liquid core
  9. 18. its just geoneutrino idk