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cycle of matter
nitrogen cycle
Plants consume carbon dioxide and convert it through photosynthesis to glucose, cellulose, and other complex molecules that build the plant. As plants use water molecules, they are split into hydrogen and oxygen.
oxygen cycle
All plants and animal require nitrogen. They use it make proteins. The nitrogen cycle has five main steps. First, when a plant or animal dies, Secondly bacteria in the soil or water break down these nitrogen compounds into ammonia. In the third step, some ammonia is converted by bacteria into ammonium ions. fourth step, nitrifying bacteria in the soil convert ammonium ions into nitrite ions, which are taken up by certain plants. In the fifth step, nitrite ions are converted into nitrate ions, dissolved in water, and taken up by plant roots.
The oxygen released makes up 21% of our atmospheric gases, and supports all life on earth. Although it is an extremely complex reaction, it can be summarized as: 6CO2 + 6H2O C6H12O6 + 6O2
WATER CYCLE
carbon cycle
It starts with cycle evaporation from bodies of water such as lakes, rivers, and streams. Water even enters the air by evaporation of soil moisture from the ground. It also enters by transpiration, which means water is taken in by the roots of plants and then enters the atmosphere through their leaves. The cool damp air we feel when we walk into a stand of trees on a warm summer day is due to transpiration.
