Everybody needs water. All plants need water. We use water to wash cups, cars, clothes and ourselves.
Where does all water come from? It comes from the clouds. The clouds can change into rain. Some of the rain goes down the ground. Some of the rain water goes down the mountains into streams (小溪). The streams come together to make rivers and lakes.
Water can change itself. When water gets very cold, it becomes ice. When water gets very hot, it becomes steam (小蒸气).
