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Matter comes in different forms like solids, liquids, and gases. We can tell them apart because they act differently. Solids are hard and keep their shape like toys or desks.
Liquids can pour and move like water or juice. Gases are like air that we breathe and can move around freely.
So, we know what something is by how it looks and how it behaves. Solid things stay in one place, liquids can flow, and gases spread out everywhere. That's how we tell the different forms of matter apart.