Across
- 4. the mixture of gases surrounding a planet
- 6. all of the liquid water and solid water on a planet
- 8. the process of making clear how your evidence supports your claim
- 9. a set of interacting parts forming a complex whole
- 10. all the living things on a plant
Down
- 1. a feature that forms on the surface of a planet, such as a mountain, channel, or sand dune
- 2. a long, narrow groove that forms where water, lava, or other liquid flows
- 3. the solid part of a rocky planet
- 5. having the conditions necessary to support life
- 7. an object, diagram, or computer program that helps us understand something by making it simpler or easier to see