Across
- 4. The thin layer of gases surrounding Earth.
- 5. A type of rock formed from cooling magma or lava.
- 6. The basic unit of life, all living organisms are made up of these.
- 7. The process by which traits are passed from parents to offspring.
- 9. The science that studies living organisms.
Down
- 1. Cycle The natural cycle that moves water through the atmosphere, land, and oceans.
- 2. Process by which green plants produce food using sunlight.
- 3. Organisms that break down dead organic matter, recycling nutrients back into the environment.
- 6. Earth's outermost layer, where we live.
- 8. The remains or impression of a prehistoric organism preserved in rock.