Understanding the Earth: Layers and Plate Tectonics

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Across
  1. 1. The thin, outermost layer of the Earth.
  2. 2. A supercontinent that existed millions of years ago before breaking apart.
  3. 7. Giant pieces of the lithosphere that move over the asthenosphere.
  4. 9. How much mass is packed into a given volume of a substance.
  5. 11. A soft, plastic layer of the mantle beneath the lithosphere that can slowly flow.
  6. 12. The slow movement of continents across the Earth’s surface over millions of years.
Down
  1. 1. Circular movement of hot and cool material in the mantle that drives plate motion.
  2. 3. The thick, less dense part of the Earth's crust that forms continents.
  3. 4. The solid, dense center of the Earth composed mainly of iron and nickel.
  4. 5. The thick layer of hot, solid rock between the crust and the core.
  5. 6. The thin, dense part of the Earth's crust under the oceans.
  6. 8. The rigid outer layer of the Earth that includes the crust and the top of the mantle.
  7. 10. The liquid layer of Earth made mostly of iron and nickel.