cycles in an ecosystem chapter 25.3. cycles all organisms need certain substances to live, grow, and...
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Cycles in an Ecosystem
Chapter 25.3
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CyclesAll organisms
need certain substances to live, grow, and reproduce.
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Many substances, such as water, pass through natural cycles in which they are used and reused.
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Some cycles include nonliving things.
Many of the chemicals move in and out of the living realm.
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The Water Cycle
Water moves continually throughout the earth by means of the water cycle.
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evaporationEnergy from the
sun changes water from a liquid to a gas through the process of evaporation.
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condensation
water vapor changes back to a liquid by the process of condensation.
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precipitationThe condensed
water forms clouds, steam, or fog, and eventually falls back to the earth as precipitation.
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The Nitrogen CycleNearly 80 percent
of the earth's atmosphere is made up of nitrogen.
Changing atmosphericnitrogen into usable compounds is callednitrogen fixation.
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The Oxygen-Carbon Dioxide Cycle
When you inhale, you take in air that contains oxygen.
When you
exhale, you release carbon dioxide back into the atmosphere.
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Another way inwhich carbon
dioxideenters the
atmosphereand becomes part
ofthe cycle is throughthe decay of deadorganisms.
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Sometimes the bodies of dead organisms do not decompose.