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What is our world made of
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Things can change from one state to another when we make them hot or cold.
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When ice or snow heats up, it melts and changes back to water
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Everything in our world comes in three different states: solid, liquid, or gas.
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The air that you breathe is a gas. We can't usually see a gas but sometimes we can feel it when it moves.
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A liquid is a thing that can flow. Some liquids are thick, and some liquids are thin.
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Look at these three pictures of things changing from one state to another.
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Trees and feathers are solids. You're a solid, too!
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Juice and milkshakes are liquids. Can you think of other kinds of liquid?
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The water was a liquid and now it's a solid.
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On a windy day, we can feel the wind on our bodies.
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When we heat water, it boils and changes to steam.
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When we make water very cold, it freezes and changes to ice.
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We can see and feel solids. Some solids are hard, and some solids are soft.
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What’s the cause of the water boiling? What’s the effect?
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The snow was a solid and now it's a liquid.
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