EARTH SCIENCE CROSSWORD PUZZLE

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Across
  1. 4. A long, deep valley on the ocean floor, often associated with seafloor spreading
  2. 6. Device that uses sound waves to detect objects
  3. 7. It is formed in subduction zones where tectonic plates collide
  4. 8. The theory explaining the movement of earth’s lithospheric plates
  5. 11. Proposed the continental drift theory in 20th century
  6. 12. Molten rock beneath the earth’s surface
  7. 14. An underwater mountain range associated with seafloor spreading
  8. 15. The process where oceanic plates sink beneath continental plates
Down
  1. 1. The boundary where two tectonic plates move away from each other
  2. 2. Outer layer of the earth includes the crust and upper mantle
  3. 3. A layer of silicate rock between the crust and the outer core
  4. 5. Preserved remains, impressions, traces, casts, or mold or plants and animals
  5. 9. The charged liquid iron due to the temperature gradient in the outer core
  6. 10. The supercontinent that is believed to have existed million years ago
  7. 13. Oceanic __________ is a key component of seafloor spreading