![]() ![]() Granite is a mixture you might find when you hike around a national park. Concrete is a good example of a man-made solid mixture. Most rocks are mixtures of many different compounds. When you have a solid with more than one type of compound, it is called a mixture. They can have pure elements or a variety of compounds inside. The atoms still vibrate and the electrons fly around in their orbitals, but the entire atom will not change its position. The molecules in a solid are stuck in a specific structure or arrangement of atoms. Atoms and molecules in liquids and gases are bouncing and floating around, free to move where they want. In the same way that a large solid holds its shape, the atoms inside of a solid are not allowed to move around too much. ![]() Liquids will flow and fill up any shape of container. Even when you grind a solid into powder, you will see tiny pieces of that solid under a microscope. You might ask, "Is baby power a solid? It's soft and powdery." Baby power is also a solid. Solids can hold their shape because their molecules are tightly packed together. A rock will always look like a rock unless something happens to it. The key is that solids hold their shape and they don't flow like a liquid. What is one physical characteristic of a solid? Solids can be hard like a rock, soft like fur, a big rock like an asteroid, or small rocks like grains of sand. ![]()
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