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Water cycle Carbon/Oxygen Cycle Nitrogen Cycle.  W.C. is a continuous process in which water moves from Earth’s surface into the atmosphere and back.

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Presentation on theme: "Water cycle Carbon/Oxygen Cycle Nitrogen Cycle.  W.C. is a continuous process in which water moves from Earth’s surface into the atmosphere and back."— Presentation transcript:

1 Water cycle Carbon/Oxygen Cycle Nitrogen Cycle

2  W.C. is a continuous process in which water moves from Earth’s surface into the atmosphere and back.  There are 3 main parts ◦ Evaporation: the process by which liquid water becomes a gas ◦ Energy is needed in order for evaporation to take place ◦ This energy comes from: THE SUN

3  Condensation: the process by which water vapor becomes liquid. ◦ Energy is released when condensation occurs ◦ Water droplets collect on dust to form clouds  Precipitation: rain, snow, sleet, hail falling from the sky

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5  Producers and consumers combine to recycle carbon and oxygen ◦ Producers take in carbon dioxide from the air during photosynthesis and store it and produce oxygen as a waste product  They use it to make sugars and starches (FOOD)  Ex. glucose ◦ Consumers eat the producers and absorb the carbon food molecules

6  Consumers take in this food and through the process of respiration create carbon dioxide as a waste product.  When consumers die, decomposers break down the remaining carbon and return it to the soil. Decomposers also create carbon dioxide.  Any type of burning of fossil fuels also releases Carbon dioxide into the air.  HOW HAVE WE CHANGED THE CARBON/OXYGEN CYCLE?

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8  The nitrogen cycle moves nitrogen from the air to the soil, into living things and back into the soil and back into the air.  Most organisms can’t use “Free” nitrogen (gas)  Nitrogen Fixation: this is the process that changes “free “ nitrogen into useable nitrogen  Most nitrogen fixation is done by bacteria (commonly found on plant roots)(legumes)  Once nitrogen has been “fixed” it can be used by organisms.

9  Plants and animals absorb the nitrogen  Decomposers break down their waste and dead plant material and return the nitrogen back to the soil  Bacteria then absorbs the nitrogen and converts it back into “Free” nitrogen gas by the process of denitrification.  Nitrogen can cycle through plants and animals many times but eventually is returned to the air

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