Earth History Vocab

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Across
  1. 4. age in exact years
  2. 5. rock that is cooled lava
  3. 7. when lava comes through to the surface from a volcano
  4. 8. the weathering of rock by water, wind or other natural agents
  5. 10. fossils of widely distributed organisms during a short period
  6. 11. when lava comes and breaks through the layers of rock present
  7. 12. age based on the position of the rocks or fossils around it
Down
  1. 1. rock that is formed in layers
  2. 2. someone who studies fossils
  3. 3. when a new trait is passed along that is more in tune with the environment
  4. 6. variation in genetics within a species
  5. 9. traces of species (in rock) that lived a long time ago
  6. 13. starts and ends after a great extinction