Across
- 7. A subdivision of a geologic eon- this is also the second longest period of geologic time
- 8. a process of determining approximate age based on the physical relationship of other around it.
- 9. all known fossils in the Earth's history arranged in chronological order.
- 11. the study of fossilized animals and plants
Down
- 1. the geologic age of a fossil, as defined by other rocks or fossils
- 2. the process by which the age of a fossil or rock is determined through measuring the decay of carbon.
- 3. a living thing that has ability to reproduce, grow, adapt and maintain homeostasis
- 4. an organism preserved in rock that is common of a particular time or period
- 5. the dying out of a larger number of organisms over a relatively short period of time
- 6. a scientist who studies the fossils of prehistoric organisms
- 7. the gradual change in living things over many generations, due to the change in environment
- 10. is a body of porosus rock or sediment saturated with groundwater.