Isabel's crossword puzzle

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Across
  1. 8. a geologic process in which tectonic plates large slabs of Earth's lithosphere—split apart from each other
  2. 10. a material's behavior under applied forces or loads
  3. 12. the solid metallic and hottest innermost layer of the planet
  4. 14. the layer of Earth's atmosphere situated between the stratosphere and the thermosphere
  5. 17. a liquid, primarily iron and nickel, layer of the Earth that surrounds the solid inner core
  6. 18. massive irregularly shaped slabs of solid rock comprising the earths lithosphere
  7. 20. a linear feature where two tectonic plates move apart
Down
  1. 1. Drift the movement of continents resulting from the motion of tectonic plates
  2. 2. the theory that the earth's lithosphere is composed of a mosaic of rigid plates that are in relative motion
  3. 3. a tectonic plate boundary where two or more lithospheric plates collide
  4. 4. the outermost solid layer of a planet or moon
  5. 5. a convergent plate boundary where one tectonic plate slides beneath another
  6. 6. thick, mostly solid silicate rock layer between Earth's crust and the outer core
  7. 7. a rock's chemical and mineral make-up
  8. 9. a partially molten ductile layer of the upper mantle beneath the lithosphere
  9. 11. a type of tectonic plate boundary where two plates slide horizontally past each other
  10. 13. a stress that squeezes or pushes rocks together often resulting in folding fracturing and the formation of mountain ranges
  11. 15. the rigid outer part of the earth consisting of the crust and upper mantle
  12. 16. a fracture in the Earth's crust where rocks on opposite sides have moved relative to each other
  13. 19. the innermost, dense, and very hot central region