Plate Tectonics and Layers of the Earth

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Across
  1. 5. boundaries that cause earthquakes
  2. 7. boundaries that create volcanoes and mountains
  3. 8. Began to explore the theory of plate tectonics and continental drift
  4. 9. plate that is less dense
Down
  1. 1. layer of the earth directly under the crust
  2. 2. outermost layer of the earth
  3. 3. boundaries that create sea floor spreading and rift valleys
  4. 4. solid center of the earth
  5. 6. plate that is the most dense