Geology on Mars

2. a long, narrow groove that forms where water, lava or other liquid flows
4. all the liquid water and solid water on a planet
6. the solid part of a rocky planet
10. a claim supported by evidence
11. any planet with a solid surface, such as Earth or Mars
13. an object, drawing or computer program that helps us understand something by making it simpler
15. the process of making clear how your evidence supports your claim
16. the mixture of gasses surrounding a planet

1. a feature that forms on the surface of a planet, such as a mountain, channel, or sand dune
3. an event or series of events that causes changes in the geosphere
4. having the conditions necessary to support life
5. to notice how two or more things are different
7. a scientist who studies the geosphere of planets in our solar system
8. information about the natural world that is used to support a claim
9. a proposed answer to a question about the natural world
12. all the living things on a planet
14. a set of interacting parts forming a complex whole