History of the Earth

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Across
  1. 3. This layer is responsible for earth's magnetic field
  2. 5. "Age of Invertebrates"
  3. 10. represents 88% of Earth's history
  4. 13. Studies Earth' history (rocks)
  5. 16. This type of rock is created from magma and lava
Down
  1. 1. "Age of the Mammals"
  2. 2. The outermost layer of the earth
  3. 4. The lithosphere and asthenosphere make make up which later of the earth
  4. 6. This type of weathering decomposes, or decays rocks and minerals
  5. 7. The process where rock is worn away or broken down into smaller and smaller pieces
  6. 8. The movement of the broken pieces of rock that have been caused by weathering
  7. 9. This type of rock is created by the effects of heat and pressure
  8. 11. Weathering and erosion help create these types of rocks
  9. 12. This type of weathering physically breaks up rock
  10. 14. The center of the earth
  11. 15. "Age of the Reptiles"