Plate Tectonics

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Across
  1. 1. a rigid layer of the Earth's crust that is believed to drift slowly.
  2. 5. a feature on the Earth's surface that is part of the terrain
  3. 7. a German polar researcher, geophysicist and meteorologist. During his lifetime he was primarily known for his achievements in meteorology and as a pioneer of polar research
  4. 10. a theory that explained how continents shift position on Earth's surface
  5. 14. one of the plates oceanic crust and lithospheric mantle is pushed, or subducted, under the other It mixes with the overlying mantle, and the addition of water to the hot mantle lowers the crust's melting point and leads to the formation of magma
  6. 16. the science that deals with the earth's physical structure and substance, its history, and the processes that act on it.
  7. 17. is the movement of the plates that make up Earth's crust lightest, most buoyant rock layer.
  8. 18. the pulling force exerted by a cold, dense oceanic plate plunging into the mantle due to its own weight
  9. 20. the upper layer of the earth's mantle, below the lithosphere, in which there is relatively low resistance to plastic flow and convection is thought to occur.
Down
  1. 2. Two plates sliding past each other
  2. 3. when two tectonic plates move away from each other
  3. 4. was a supercontinent that existed during the late Paleozoic and early Mesozoic eras
  4. 6. Convective heat transfer, often referred to simply as convection, is the transfer of heat from one place to another by the movement of fluids.
  5. 8. gravitational forces acting on the young, raised oceanic lithosphere around mid-ocean ridges
  6. 9. arge-scale processes affecting the structure of the earth's crust
  7. 11. oceanic crust is often forced down into the mantle where it begins to melt.
  8. 12. the science that deals with the earth's physical structure and substance, its history, and the processes that act on it.
  9. 13. he sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate.
  10. 15. volcanic activity or phenomena.
  11. 19. the rigid outer part of the earth, consisting of the crust and upper mantle.