What We As Students Can Do To Save Our World
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After viewing our curriculum units, please take a few minutes to help us understand how the units, which were created by public school teachers, may be useful to others.
Air is a mixture of gases, oxygen, nitrogen, carbon dioxide, argon and minimal amounts of a few other gases. The first three are necessary for living things. These gases are exchanged among reservoirs in a continuous cycle. Plants take in carbon dioxide in the food making process. Also during this process, they release oxygen into the atmosphere. Living things take in oxygen to break down the food they eat to produce energy. This happens in a continuous cycle. As we breathe, we remove some oxygen from the air. When we exhale, we add carbon dioxide to the air. You probably are asking yourself, why don’t we use up the oxygen in the air. Green plants change carbon dioxide back into oxygen. This is called the oxygen-carbon dioxide cycle. Life cannot exist without the oxygen we get from air.