earth science crossword

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Across
  1. 3. a deep underwater valley
  2. 5. is the action of one plate pushing below the other
  3. 6. waves- a body wave that travels about 6 km through earths crust
  4. 8. a seismometer produces a record of ground motion
  5. 10. plate boundary- occurs where tectonic plates collide
  6. 11. ridge- ridge lay right along the middle of the ocean floor
  7. 12. drift theory- states that the continents have not always been in their present locations but "drifted" there over a million years
  8. 13. refers both to the extent of ancient glaciers and to the rock makings they have left behind
  9. 15. fault- a fault that occurs at a transform plate boundary
Down
  1. 1. is a sudden, ground shaking release of built-up energy at or under Earths surface
  2. 2. plates- earths broken into large, movable slabs of rock
  3. 4. pull- as the edge of a tectonic plate sub ducts deep into the mantle, it pulls the rest of the plate with it
  4. 6. is the study of the magnetic properties of the ancient rocks
  5. 7. reversal- is the direction that can completely reverse
  6. 9. a partly molten layer in the upper mantle
  7. 14. belt- a long chain of volcanoes
  8. 16. molten rock from beneath the earths surface