science

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Across
  1. 4. the numeric age of a layer of rocks or fossils
  2. 5. any fault lines or intrusions that cut across a set of rock strata must be younger than that set of rock
  3. 10. a non-living part of an ecosystem that shapes its environment
  4. 11. when species vanish much faster that they are replaced
  5. 12. a surface of contact between two groups of unconformable strata
  6. 13. the change in the characteristics of a species over several generations
Down
  1. 1. the branch of science concerned with fossil animals and plants
  2. 2. living things within an ecosystem
  3. 3. preserved paths of animals that crawled on and bored or burrowed into the seafloor
  4. 6. the age of a rock layer compared to other layers
  5. 7. depicts layers of different rocks, with the oldest at the bottom and the youngest at the top
  6. 8. a large natural or artificial lake used as a source of water supply
  7. 9. the mold of an organism in a rock