Volcanoes and Plate Tectonics

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Across
  1. 1. this is a type of evidence that continents are moving
  2. 5. this type of volcano has explosive eruptions followed by outpourings of lava
  3. 6. pieces of the crust that float on the mantle
  4. 12. this crust is made from basalt rock and is very dense
  5. 15. the force responsible for plate movements
  6. 17. theory that explains that crustal plates are moving the mantle
  7. 18. Volcanoes can shoot ___ high into the atmosphere
  8. 19. 75% of Earth's volcanoes happen here
  9. 20. places where the sea floor is spreading
Down
  1. 2. this type of volcano looks like a giant ______
  2. 3. a mountain that forms when magma is forced to the Earth's surface
  3. 4. this crust is granitic and 20-30 miles thick
  4. 7. technical name for the crust and upper mantle
  5. 8. clouds of hot ash and volcanic glass flowing down the mountain side
  6. 9. this part of the Earth is made of iron and nickel
  7. 10. These can block out the sun light
  8. 11. contains most of Earth's mass
  9. 13. german scientist who originated the continental drift theory
  10. 14. this happens when new oceanic crust is created and older material is pushed away
  11. 16. small volcanoes made from ash and rocks