Plate Tectonics

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Across
  1. 4. a theory that the middle of the ocean is spreading apart, forming new oceanic crust
  2. 9. a deep valley that forms as a result of tectonic plates moving apart on land
  3. 10. two plates moving apart
  4. 14. tiny currents that carry thermal energy
  5. 17. an instrument that records the motions of the Earth, especially earthquakes
  6. 18. relating to earthquakes
  7. 19. the maximum height of a wave crest or depth of a trough
  8. 20. an area in the middle of a lithospheric plate where magma rises from the mantle and erupts at the Earth's surface
  9. 22. an abrupt movement of soil and bedrock downhill in response to gravity
  10. 23. the opening at the Earth's surface through which volcanic materials erupt
  11. 25. rock that in its molten form issues from volcanos
  12. 27. the supercontinent that existed 335 million years ago
  13. 30. the place where two or more plates in the Earth's crust meet
  14. 31. a sudden violent shaking of the ground
  15. 32. a scientist who studies earthquakes
  16. 36. a written record of an earthquake, recorded by a siesmograph
  17. 37. the man who established the theory of continental drift
  18. 38. semiliquid rock found beneath the earth's surface
  19. 39. a deep ditch under the ocean along a tectonic plate boundary
  20. 42. two plates moving towards each other
  21. 44. a geologist that uses physical principles to study the properties of the earth
  22. 45. a fracture in rock where movement has occurred
  23. 46. the gradual movement of the continents across the earth's surface as a result of the movement of the plates they lie on
Down
  1. 1. the layer of the earth below the crust
  2. 2. an exceptionally large ocean wave, especially one caused by an underwater earthquake or volcanic eruption
  3. 3. one plate sliding against another
  4. 5. a region in which earthquakes are known to occur
  5. 6. the regions of the Earth where living organisms exist
  6. 7. stream of molten rock that erupts relatively nonexplosively from a volcano and moves slowly downslope.
  7. 8. the system used to measure the strength of an earthquake
  8. 11. the movement of one tectonic plate under another tectonic plate
  9. 12. underwater cliffs between the beach and ocean
  10. 13. relating to eruptions of gas and lava from the Earth's crust
  11. 15. one of the large landmasses of the earth
  12. 16. a single thickness of some substance or material
  13. 21. an active volcano that is in repose but is expected to erupt in the future.
  14. 24. the degree of hotness or coldness
  15. 26. an underwater earthquake
  16. 28. the strength of an earthquake
  17. 29. outer layer of the earth
  18. 33. a landform where molten rock erupts through the surface of the planet
  19. 34. a risk
  20. 35. pieces of the earth's crust
  21. 40. the centre of the earth
  22. 41. a measure of the effects of an earthquake at a particular place on humans, structures and (or) the land itself
  23. 43. a series of underwater mountains that form as a result of tectonic plates moving apart and allowing magma to rise to the surface