Geologic Time

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Across
  1. 2. Not the exact age of a fossil/rock
  2. 3. years ago, The first life on earth was created then.
  3. 6. age, The exact age/year of a fossil or rock
  4. 8. The amount of time it takes for half of an atom to decay
  5. 9. A feature that cuts across a sequence of rocks is younger than everything it cuts.
  6. 10. Fossils or rocks that are lower in the ground than another are older than those above them.
Down
  1. 1. a way of finding absolute age of something
  2. 4. Any rock or fragment that is included inside of another rock is older than the rock that it is inside.
  3. 5. the timeline used by scientists to date events on earth
  4. 7. An object from the past that can be found in the ground and studied.