Earth Science Vocab Crossword Puzzle

5. A large natural or artificial lake used as a source of water supply
6. Any fault lines or intrusions that cut across a set of rock strata must be younger than that set of rock
9. Living things within an ecosystem
11. the change in the characteristics of a species over several generations
12. Preserved paths of animals that crawled on and bored or burrowed into the seafloor
13. The branch of science concerned with fossil animals and plants
16. The process by which food is made by bacteria or other living things using chemicals as the energy source
19. Calculates an age in years for geologic materials
22. The theory that changes in the earth's crust during geological history
23. The oldest layer is at the base and that the layers are progressively younger with ascending order in the sequence

1. the numeric age of a layer of rocks or fossils
2. When species vanish much faster than they are replaced
3. depicts layers of different rocks, with the oldest at the bottom and the youngest at the top
4. The age of a rock layer compared to other layers
7. A non-living part of an ecosystem that shapes its environment
8. The mold of a organism in a rock
10. A surface of contact between two groups of unconformable strata
13. 4,600 million years ago
14. A very long span of geologic time
15. The process by which green plants and some other organisms use sunlight to synthesize
17. a fossil that is useful for dating and correlating the strata in which it is found
18. The time required for one-half of the radioactive (parent)isotopes in a sample to decay to radiogenic (daughter) isotopes
20. The flow of water towards or out of one reservoir to another
21. the beginning of a distinctive period