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The Carbon and Nitrogen Cycles. What is Carbon?  Carbon is an element that is in all living things.  Molecules containing carbon are called Organic.

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Presentation on theme: "The Carbon and Nitrogen Cycles. What is Carbon?  Carbon is an element that is in all living things.  Molecules containing carbon are called Organic."— Presentation transcript:

1 The Carbon and Nitrogen Cycles

2 What is Carbon?  Carbon is an element that is in all living things.  Molecules containing carbon are called Organic.

3 Carbon Cycle  The movement of carbon from the environment into living things and then back again is the Carbon Cycle.  You already know how carbon dioxide cycles between photosynthesis and cellular respiration.

4 Carbon Cycle  Carbon dioxide in the air enters into living things through photosynthesis.  Oxygen and glucose produced from photosynthesis are then used by plants and animals for cellular respiration.  Cellular respiration produces carbon dioxide to be released again.

5 Carbon Cycle  Keep in mind all living things have carbon in them, so when they die, decomposers help return that carbon to the environment and soil.

6 Carbon Cycle  Carbon in the environment is used to make coal, oil, and natural gas (fossil fuels).  Fossil fuels are burned in a process called Combustion.  Combustion releases carbon dioxide back into the air.

7 What is nitrogen? o Nitrogen is used to build proteins and DNA.

8 Nitrogen Cycle  The movement of nitrogen from the environment to living things and back again is the Nitrogen Cycle.  About 78% of the Earth’s atmosphere is nitrogen gas, however most organisms cannot use nitrogen when it’s in a gas form.

9 Nitrogen Cycle  Nitrogen fixation is when lightning or bacteria in the soil change nitrogen gas into a form that can be taken up by plant roots.

10 Nitrogen Cycle  Animals eat the plants and therefore take in nitrogen.  When animals and plants die, decomposers help return the nitrogen to the soil.  Other bacteria then change the nitrogen in the soil back into a gas to be released back into the air.


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