WATER CYCLE LESSON
Print The Water Cycle reading
comprehension passage and questions (see
Students should read the passage
silently, then answer the questions. Teachers may also use the text as
part of a classroom lesson plan.
Water. We drink it, bathe in it, and swim in it. We use it to cook our food, to wash our clothes and cars, to brush our teeth, and to make ice to keep our drinks cool. Did you ever stop to think about what an amazing chemical compound water is?
First, water is made of two different elements. They are hydrogen and oxygen. Yes, oxygen, the gas we breathe. Hydrogen is found as a gas, too. But when two atoms of hydrogen join chemically with one atom of oxygen, we have an amazing new compound – water! Water's chemical symbol is H2O. This means there are two hydrogen atoms for every oxygen atom.
Water is amazing because it can exist in all three states of matter here on Earth. It can be in the solid we call ice. It can be liquid water. It can be a gas we call water vapor. Water on the on surface of Earth is constantly changing between these three states. Water freezes to become ice. Water can evaporate to become water vapor. Water vapor can cool to become water or ice. These continuous changes in state create the cycle of water.
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