Geologic time crossword puzzle

2. rocks made of loose eroded particles that harden together over time.
3. methods measure the physical properties of an object itself and use these measurements to calculate its age.
9. The age of a rock layer (or the fossils it contains) compared to other layers.
10. The naturally preserved remains or impressions of organisms the lived on the land long ago.
11. Broken down pieces of rock that are moved from one place and deposited in another.
14. The study of strata to determine the history of the land
15. The numerical age of rock layer.

1. a diagram that shows how scientists think different organisms are related.
4. States that a layer of rock is younger than the layer below it and older than the layer above it.
5. Determines if one rock is older than the other.
6. fossils that show the link between past and present organisms.
7. Fossils used by scientists to more accurately determine the age of a nearby fossil or layer of rock.
8. find the precise age of a fossil
12. Another word for a backbone.
13. layers of rock