Grade 3 · Science · Lesson 18

States of Matter in Action

All the material around us is made of matter. Matter exists in three main states: solid, liquid, and gas. The state of matter depends on how the tiny particles (atoms and molecules) inside it are arranged and how much they move.

What this lesson teaches

1Describe the three states of matter and their key properties
2Classify everyday materials as solid, liquid, or gas
3Explain how matter changes state when heated or cooled

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