Christopher's crossword puzzle

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Across
  1. 1. The mostly-solid bulk of the earth's interior
  2. 3. Shells, bones, stone imprints of animals or microbes, exoskeletons, objects preserved in amber, petrified wood, coal, hair, oil, and DNA remnants
  3. 5. The outermost shell of a terrestrial planet
  4. 7. Where the new crust is generated as the plates pull away from each other
  5. 8. More than zero
  6. 9. Where the crust is destroyed as one plate dives under another
  7. 12. The very hot, very dense center of our planet
  8. 13. A large continuous mass of land conventionally regarded as a collective region
  9. 14. A supercontinent that incorporated almost all the landmasses on Earth
  10. 15. Continent in the Western Hemisphere
Down
  1. 2. A collection of facts or information that suggests whether something is true or false
  2. 4. A scientific theory that explains how major landforms are created as a result of Earth's subterranean movements
  3. 6. An explanation for why things work or how things happen
  4. 8. Regular and intelligible forms or sequences that can be found throughout nature
  5. 10. Less than zero
  6. 11. Continent in the Eastern Hemisphere