Unit 6: Plate Tectonics

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Across
  1. 4. German scientist who proposed the theory of continental drift
  2. 5. all of the continents on Earth used to be joined as one giant landmass and have since slowly drifted to their current locations
  3. 6. a depression of the earth's surface in which an ocean lies
  4. 8. the location where one tectonic plate come in contact with another
  5. 11. the process in Earth’s mantle that scientists believe is driving the movement of the plates due to the heating and cooling of magma
  6. 15. a mountain from which lava, ash, and hot gases flow or are ejected during an eruption
  7. 16. an event that occurs when tension built up along Earth’s plates is released
  8. 18. the deepest parts of the ocean floor
  9. 20. the type of plate boundary where two plates slide past each other
  10. 22. a curved chain of volcanic islands
  11. 23. the type of plate boundary where two plates collide
  12. 25. the most common types of rock that make up oceanic crust
  13. 26. the type of plate boundary where two plates separate or divide
Down
  1. 1. states that in undisturbed rock layers, the oldest rocks are at the bottom and younger rocks are at the top
  2. 2. has had an eruption of magnitude 8 on the Volcano Explosivity Index (VEI)
  3. 3. the process that occurs when one plate sinks beneath another plate because it is more dense
  4. 7. thick part of Earth’s crust that forms the landmasses
  5. 9. occurs in the middle of a plate, where magma rises upward until it erupts on the seafloor
  6. 10. an underwater mountain range, formed by the movement of plates
  7. 12. the most common types of rock that make up continental crust
  8. 13. an area of land that rises very high above the land around it
  9. 14. a fracture or break in the rocks that make up Earth’s crust
  10. 17. a lowland region that forms where Earth's tectonic plates move apart
  11. 19. supercontinent that included all current land masses before they split apart
  12. 21. the process that occurs at mid-ocean ridges, where new oceanic crust is formed
  13. 24. thin part of Earth’s crust under oceans and seas