Earth and Space Science

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Across
  1. 1. Thicker, less dense part of Earth's crust forming continents
  2. 4. Circular movement in the mantle that drives plate motion
  3. 7. The massive ocean that surrounded Pangea
  4. 8. Process where oceanic plate sinks beneath a continental plate
  5. 12. A fold in rock that bends downward to form a valley
  6. 16. Large sections of Earth's lithosphere that move over the asthenosphere
  7. 19. Type of boundary where one plate sinks beneath another
  8. 20. Fault where rocks on either side move past each other sideways
Down
  1. 2. Process by which new oceanic crust is formed at mid-ocean ridges
  2. 3. A break in the Earth's crust where the hanging wall moves down
  3. 5. Type of boundary where new crust is created as plates move apart
  4. 6. Type of boundary where plates slide past each other
  5. 9. The supercontinent that existed during the late Paleozoic and early Mesozoic eras
  6. 10. Wegener's theory that continents move slowly over Earth's surface
  7. 11. A zone of frequent earthquakes and volcanic eruptions encircling the Pacific Ocean
  8. 13. An underwater mountain chain where sea-floor spreading occurs
  9. 14. An upward fold in rock formed by compression of Earth's crust
  10. 15. Thinner, denser part of Earth's crust beneath oceans
  11. 17. A break in the Earth's crust where the hanging wall moves up
  12. 18. Southern supercontinent that split from Pangea