Across
- 2. characteristic or property of an organism
- 4. the part of the Earth in which life can exist
- 7. species of animal that lived but no longer does
- 8. Come from decay of organism; pressed tightly together
- 10. physical evidence of an organism from a past geologic age
- 12. layers of gas that surround a planet
- 15. all water on, under, and above the Earth
- 17. set of statements or principles devised to explain a group of facts
- 18. any individual living thing
- 19. the chemical element consisting of one proton and one electron
Down
- 1. the continual movement of water between land, ocean, and air
- 3. study of fossils and the fossil record
- 5. energy that comes from the sun
- 6. the process in which plants and some other organisms use the energy in sunlight to make food
- 7. theory that the various types of animals and plants have their origin in other preexisting
- 9. place or role that an organism has in its habitat
- 11. nuclear reaction resulting in release of large amounts of energy
- 13. group of organisms that share similar characteristics
- 14. process in which matter changes from liquid to a gas
- 16. to break down or wear away