Geological Time Scale

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Across
  1. 2. The Eon in earth's history when the first glaciers formed
  2. 3. The law stating that any rock or fragment that is inside another rock is older than the rock in which it is concluded
  3. 4. The Eon in earth's history when the planet's surface cooled and the continents formed
  4. 6. Describes the type of age dating when a certain rock layer or other specimen is older or younger in relation to another specimen
  5. 9. The rate of decay of radioactive isotopes
  6. 10. Describes the type of fossils used to represent a specific time; used to determine age
Down
  1. 1. The law stating that any feature that cuts across a layer of rocks is younger than everything it cuts
  2. 5. The law stating that the oldest rock is on the bottom and the youngest rock is on the top in an undisturbed layer of rocks
  3. 7. Describes the type of age dating where the exact age of a rock layer or specimen is determined by how fast certain isotopes decay
  4. 8. The Eon in earth's history before life existed and the solar system was still being formed