Plate Tectonics

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Across
  1. 1. Innermost part of a core
  2. 5. Earth's surface is divided into large pieces of rigid rock which move over Earth's hot and semi-plastic mantle
  3. 10. The person who proposed that continents move
  4. 11. The boundary between two plates that move toward each other
  5. 12. Happens at subduction zones where one plate is pulled down into the mantle
  6. 13. Supercontinent
  7. 15. When one tectonic plate moves under another tectonic plate
  8. 17. The process by which new oceanic crust forms along a mid-ocean ridge and older oceanic crust moves away from the ridge
  9. 19. Heat is higher up, cold sinks
  10. 20. Second to last layer of the Earth
Down
  1. 2. When magnetized objects orient themselves to point north
  2. 3. Part of the Earth between the core and the crust
  3. 4. When magnetized objects reverse direction and orient themselves to point south
  4. 6. Hypothesis which suggests that the continents are in constant motion
  5. 7. Mountain range on the ocean floor, formed by magma at divergent plate boundaries
  6. 8. An event that causes a magnetic field to reverse direction
  7. 9. The boundary between two plates that slide past each other
  8. 14. The rigid outer part of the earth, consisting of the crust and upper mantle
  9. 16. The process that results when magma rises at a mid-ocean ridge and pushes oceanic plates in two different directions away from the ridge
  10. 18. Outermost layer of a planet