Plate Tectonics CW 3

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Across
  1. 3. A solid form of carbon dioxide that is very cold and turns directly from a solid to a gas.
  2. 5. To reuse something that would have otherwise been thrown out or to turn it into something usable again instead of sending it to a landfill.
  3. 7. A boundary of two tectonic plates where the plates move towards each other.
  4. 10. A scientist who studies earthquakes.
  5. 13. a cycle of heating, rising, cooling and sinking
  6. 14. a deep valley where pieces of Earth’s crust diverge on land
  7. 15. When two tectonic plates slowly crash into each other and mountains are formed.
  8. 18. the layer below the lithosphere and is plasticlike
  9. 19. Wegener’s hypothesis that all continents were once connected in a large landmass that broke apart & drifted slowly to their current positions
  10. 21. this layer is formed with the crust and rigid upper mantle, and is above the asthenosphere
  11. 23. a theory that proposes that magma under Earth’s crust is forced up toward the surface at the mid-ocean ridges, forming new seafloor
  12. 25. Slowly moving pieces of Earth’s crust.
  13. 26. scientist that discovered sea-floor spreading
  14. 27. melted rock
  15. 28. All the rock, soil and sediments that makeup Earth’s land. It comes from the word “Geo” which means “Earth.”
  16. 31. All the gases surrounding the earth. It comes from the word “Atmos” which means “air.”
  17. 33. large sections of Earth’s crust and upper mantle
  18. 34. scientist that developed the idea of continental drift
  19. 35. deep underwater canyons
  20. 36. large, slow moving bodies of ice on land
  21. 37. When one tectonic plate converges under another due to density differences.
Down
  1. 1. All the oceans, rivers, lakes and water on Earth. It comes from the word “Hydro” which means “water.”
  2. 2. a chain of ridges and valleys stretching along Earth’s ocean floor
  3. 4. pull-apart forces
  4. 6. Movement caused by warm fluids rising and cooler fluids sinking.
  5. 8. forces that destroy and wear away landmasses through process like erosion and weathering
  6. 9. the process of moving things from one place to another.
  7. 11. A boundary of two tectonic plates where the plates slide past each other.
  8. 12. these are constantly being created and destroyed by competing forces
  9. 16. a single landmass composed of all the continents joined together
  10. 17. All the living things on Earth. It comes from the word “Bio” which means “life.”
  11. 20. a measure of how much mass there is in a given volume of a substance
  12. 22. forces that shape the land’s surface by building up mountains & other landmasses.
  13. 24. breaks in Earth’s crust where rocks have slipped past each other
  14. 29. any trace of an ancient organism that has been preserved in rock
  15. 30. The outer most layer of the Earth. This is the layer we walk on.
  16. 32. A boundary of two tectonic plates where the plates move away from each other.