Plate Tectonics

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Across
  1. 2. Geologist that discovered that mid-ocean ridges were expanding
  2. 4. Bendable solid layer of the earth that has convection currents
  3. 6. Fernlike plant,from 250 million year ago, found on 5 continents
  4. 8. Layer between the crust and the core
  5. 9. Theory:the continents were once a single landmass(hint:2 word answer with no space)
  6. 10. Mass in a given space
  7. 14. The cycle of rising and falling of molten rock in the mantle
  8. 15. Earth layer made of crust and upper mantle, rigid
  9. 17. Layer of the earth that is a liquid
  10. 18. Tool that uses sound waves to measure the distance of an object
Down
  1. 1. Scientist that observed that the coastlines of continents matched up
  2. 3. Name of the supercontinent
  3. 5. Dark fine grained rock found in the oceanic crust
  4. 7. Process:the ocean floor sinks below a trench
  5. 11. Hottest layer of the earth
  6. 12. Rock that is light colored usually found in the crust
  7. 13. Reptile that lived in free water millions of years ago
  8. 16. Type of crust that is made of basalt