Rocky Planet - Any planet with a solid surface, Habitable - Having the conditions necessary to support life , system - A set of interacting parts forming a complex whole, evidence -  information about the natural world that is used to support or go against a claim, claim - a proposed answer to a question , reasoning - the process of making clear how your evidence supports your claim, channel - A long narrow groove that forms where water, lava, or other liquid flows, geologic process - An event or series of events that causes changes in the geosphere, landform - A feature that forms on the surface of a planet, model - An object, diagram, or computer program that helps us understand,

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