2Water CycleW.C. is a continuous process in which water moves from Earth’s surface into the atmosphere and back.There are 3 main partsEvaporation: the process by which liquid water becomes a gasEnergy is needed in order for evaporation to take placeThis energy comes from: THE SUN
3Water CycleCondensation: the process by which water vapor becomes liquid.Energy is released when condensation occursWater droplets collect on dust to form cloudsPrecipitation: rain, snow, sleet, hail falling from the sky
5Carbon/Oxygen CycleProducers and consumers combine to recycle carbon and oxygenProducers take in carbon dioxide from the air during photosynthesis and store it and produce oxygen as a waste productThey use it to make sugars and starches (FOOD)Ex. glucoseConsumers eat the producers and absorb the carbon food molecules
6HOW HAVE WE CHANGED THE CARBON/OXYGEN CYCLE? 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?
8Nitrogen CycleThe 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 nitrogenMost nitrogen fixation is done by bacteria (commonly found on plant roots)(legumes)Once nitrogen has been “fixed” it can be used by organisms.
9Nitrogen cycle Plants and animals absorb the nitrogen Decomposers break down their waste and dead plant material and return the nitrogen back to the soilBacteria 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