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[Audio] Matter is all around us and makes up everything we can see. Matter is composed of particles that interact with each other to form everything from atoms to planets. The three basic states of matter are solid, liquid, and gas. In a solid, the particles are packed together closely in a fixed arrangement, making the shape of the solid rigid. In a liquid, the particles are more loosely arranged, allowing the liquid to easily flow and take the shape of its container. In a gas, the particles are even more loosely arranged and can move freely, which allows the gas to quickly expand and fill a space..