What is a solid liquid or gas on a planet?

A solid, liquid, or gas on a planet refers to the three primary states of matter that can exist in different forms depending on temperature and pressure. For example, water can exist as ice (solid), liquid water, or water vapor (gas) depending on the environmental conditions. Each state has distinct properties and behaviors, influencing the planet's geology, climate, and potential for life. The presence of these states is crucial for understanding a planet's atmosphere and surface processes.