Across
- 5. of inclusions:Any rock or fragment that’s included inside of another rock is older than the rock in which it is included.
- 7. age dating:Absolute age dating gives age in actual years.
- 9. age dating:Relative age is looking at something and guessing its age without testing.
- 10. Largest division of geologic time
Down
- 1. time scale:It is a way of dating different fossils and rocks to find when certain things are existing.
- 2. Fossils are recognised to represent a period of time or on radioactive decay of specific isotopes.
- 3. Half life means the amount of time it takes for half of a remaining isotope to decay to a daughter product.
- 4. of superposition:In an undisturbed sequence of rocks,the oldest rocks are on the bottom and the youngest rocks are on top.
- 6. of crosscutting:Any feature that cuts across a sequence of rocks,is younger than everything it cuts.
- 8. unit of geologic time that includes two or more periods