Across
- 4. all the liquid water and solid water (ice) on a planet
- 7. having the conditions necessary to support life
- 8. the mixture of gases surrounding a planet
- 11. a long, narrow groove that forms where water, lava, or other liquid flows
- 12. to notice how two or more things are alike or different
Down
- 1. the solid part of a rocky planet
- 2. all the living things on a planet
- 3. the process of making clear how your evidence supports your claim
- 5. information about the natural world that is used to support or go against (refute) a claim
- 6. a feature that forms on the surface of a planet, such as a mountain, channel, or sand dune
- 9. a set of interacting parts forming a complex whole
- 10. a proposed answer to a question about the natural world