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