Marine Biology Plate Tectonics

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Across
  1. 3. Flat topped underwater volcanic mountains
  2. 4. plates, Large rigid pieces of Earths lithosphere that move over the mantle
  3. 5. crust, The thin dense layer of crust that forms the ocean floor mostly made of basalt
  4. 9. Underwater volcanic mountains that rise from the ocean floor but do not reach the surface
  5. 11. drift, The theory that continents slowly move across the Earths surface over time
  6. 13. tectonics, The theory that Earths lithosphere is broken into plates that move and interact at boundaries
  7. 16. ocean ridge, An underwater mountain range where new oceanic crust forms at divergent plate boundaries
  8. 17. The thick layer of Earth between the crust and core made of hot solid rock that flows slowly
  9. 19. margin, A continental margin located near a plate boundary with frequent earthquakes and volcanoes
  10. 21. margin, A continental margin far from plate boundaries with little earthquake or volcanic activity
  11. 22. The central part of the Earth composed mostly of iron and nickel divided into inner and outer layers
  12. 23. A dark dense volcanic rock that makes up much of the oceanic crust
Down
  1. 1. margin, The zone where the continental crust meets the oceanic crust
  2. 2. rise, The gently sloping area at the base of the continental slope made of sediments
  3. 6. shelf, The shallow submerged edge of a continent extending into the ocean
  4. 7. A light colored coarse grained rock that makes up much of the continental crust
  5. 8. anomalies, Variations in the Earths magnetic field caused by the movement of seafloor rocks
  6. 10. The process where one tectonic plate sinks beneath another into the mantle
  7. 12. canyon, A steep sided valley cut into the continental shelf and slope often leading to the deep ocean
  8. 13. The supercontinent that existed about 300 million years ago before breaking apart into todays continents
  9. 14. plains, Flat deep areas of the ocean floor found between the continental rise and mid ocean ridges
  10. 15. Deep narrow depressions in the ocean floor formed at subduction zones
  11. 18. The outermost layer of the Earth which includes continental and oceanic crust
  12. 20. spreading, The process by which new oceanic crust forms at mid ocean ridges and moves outward