| A | B |
|---|
| habitable | : having the conditions necessary to support life |
| rocky planet | any planet with a solid surface |
| system | a set of interacting parts forming a complex whole |
| atmosphere | the mixture of gases surrounding a planet |
| biospere | all the living things on a planet |
| channel | a long, narrow groove that forms where water, lava, or other liquid flows |
| claim | a proposed answer to a question about the natural world |
| compare | to notice how two or more things are alike or different |
| evidence | information about the natural world that is used to support or go against (refute) a claim |
| geologic process | an event or series of events that causes changes in the geosphere, such asflowing water or flowing lava |
| geosphere | the solid part of a rocky planet |
| hydrosphere | all the liquid water and solid water (ice) on a planet |
| landform | a feature that forms on the surface of a planet, such as a mountain, channel, or sand dune |
| model | an object, diagram, or computer program that helps us understand something by making itsimpler or easier to see |
| planetary geologist | a scientist who studies the geospheres of planets in our solar system |
| reasoning | the process of making clear how your evidence supports your claim |
| scientific argument | a claim supported by evidence |
| system | a set of interacting parts forming a complex whole |
