Tectonics Mid-Unit Test

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Across
  1. 3. The upper layer of the Earth’s mantle
  2. 5. margin Boundary that occurs when plates move apart
  3. 6. The point inside the Earth’s crust where an earthquake occurs
  4. 7. margin Boundary that occurs when two continental plates collide
  5. 11. When plates under the ocean collide and displace a large volume of water
  6. 12. push When new, less dense crust rises to form ocean ridges
  7. 13. margin Where two or more plates meet
  8. 16. currents Movement within the Earth’s mantle caused by the heat of the core
  9. 18. When the pressure at plate margins causes violent shaking on the surface
  10. 20. currents Circular movements of magma within the Earth’s mantle
Down
  1. 1. The semi-molten layer if the Earth which is about 3,000 km thick
  2. 2. margin Boundary that occurs when an oceanic and a continental plate move towards each other
  3. 4. The point on the ground surface directly above the focus of an earthquake
  4. 8. The more rigid outer part of the Earth
  5. 9. pull When a denser plate subducts under a lighter one
  6. 10. core A liquid layer of the Earth that is 2,000km thick
  7. 14. core The solid inner layer of the Earth which reaches temperatures of 5,200° Celsius
  8. 15. margin Boundary that occurs where plates slide past each other in opposite directions
  9. 17. When an oceanic plate is pushed under a continental plate at a destructive plate margin
  10. 19. The thin rocky outer layer of the Earth approximately 5 to 70 km thick