Layers of Earth

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Across
  1. 3. the heat source for convection currents
  2. 5. continental crust is thicker than oceanic because it contains
  3. 7. the layers on the inside of Earth have the ___ temperatures
  4. 9. cycle of heating up and cooling down materials
  5. 11. the Earth's crust is composed of silicon, aluminum and ___
  6. 12. outermost layer
  7. 13. this layer can contain both oceanic and continental crust
  8. 16. the lower mantle is ____ dense than the upper mantle
  9. 17. the oceanic crust is ____ than continental crust
  10. 18. cooler materials ____ as opposed to warmer materials which float
Down
  1. 1. the asthenosphere is known as the _____ layer
  2. 2. volcanic ____ on the ocean floor tells scientists about the inside of Earth
  3. 4. the layer where circular currents take place
  4. 6. warm materials have more heat which means more _____
  5. 8. the inner core is _____
  6. 10. type of plates which make up the lithosphere
  7. 13. the inside of Earth is formed into
  8. 14. the amount of cores inside Earth
  9. 15. the layers on the outside of Earth are the ____ dense