Cycles in an ecosystem
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Cycles in an Ecosystem. Chapter 25.3. Cycles. All organisms need certain substances to live, grow, and reproduce. Many substances, such as water, pass through natural cycles in which they are used and reused. Some cycles include nonliving things.

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Cycles in an ecosystem

Cycles in an Ecosystem

Chapter 25.3


Cycles

Cycles

  • All organisms need certain substances to live, grow, and reproduce.


Cycles in an ecosystem

  • Many substances, such as water, pass through natural cycles in which they are used and reused.


Some cycles include nonliving things

Some cycles include nonliving things.

  • Many of the chemicals move in and out of the living realm.


The water cycle

The Water Cycle

  • Water moves continually throughout the earth by means of the water cycle.


Evaporation

evaporation

  • Energy from the sun changes water from a liquid to a gas through the process of evaporation.


Condensation

condensation

  • water vapor changes back to a liquid by the process of condensation.


Precipitation

precipitation

  • The condensed water forms clouds, steam, or fog, and eventually falls back to the earth as precipitation.


The nitrogen cycle

The Nitrogen Cycle

  • Nearly 80 percent of the earth's atmosphere is made up of nitrogen.

  • Changing atmospheric

    nitrogen into usable compounds is called

    nitrogen fixation.


The oxygen carbon dioxide cycle

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.


Cycles in an ecosystem

  • Another way in

    which carbon dioxide

    enters the atmosphere

    and becomes part of

    the cycle is through

    the decay of dead

    organisms.


Cycles in an ecosystem

  • Sometimes the bodies of dead organisms do not decompose.


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