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States of Matter


What happens to snow when the weather turns warm? It changes form. It goes from solid to liquid to gas. These are the main states of matter. Everything is solid, liquid, or gas. Heat and cold make matter change forms.

Changing Forms

Ice and snow are solid forms of water. Solids hold their shape. A snowman is an example of solid water.

As the weather warms, a snowman melts. It turns to liquid water. Liquid does not have one shape. The water soaks into the ground.

As it gets warmer, the water evaporates. This means it turns into a gas. The gas is called water vapor. The ground dries as water vapor rises.

The vapor cools as it rises. It turns back into water. This forms clouds. If the water freezes, it can fall again as snow.