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