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HOME Water that has condensed in the air forms clouds Drops fall to Earth and accumulate in oceans and lakes Back to the Water Cycle Evaporation Using Water Plants and animals need water to live Water is pulled from bodies of water or from the ground (groundwater) Back to the Water Cycle Precipitatio n Waste Plants return water to environment through transpiration • The evaporation of water from their leaves Animals return water to ground and bodies of water through urine Back to the Water Cycle Using Water Evaporation Water from oceans, lakes, and other bodies of water re-enters the atmosphere through evaporation Back to the Water Cycle Waste Precipitation HOME The process where plants use CO2 from the atmosphere to make high-energy carbon molecules (glucose) Back to the Carbon Cycle Respiration Gas Exchange Metabolism Pollution Organisms use high energy carbon molecules for growth Back to the Carbon Cycle Photosynthesis Respiration Waste Decompositio n CO2 is released through aerobic respiration (breathing, for example) Back to the Carbon Cycle Metabolism Decompositio n Photosynthesis Carbonates released into ground and water supply Back to the Carbon Cycle Metabolism Photosynthesis Decomposition Gas Exchange CO2 is exchanged between the air and water Back to the Carbon Cycle Waste Photosynthesis When organisms die and decay, the carbon molecules in them enter the soil. Microorganisms break down the molecules, releasing CO2 Back to the Carbon Cycle Metabolism Photosynthesis Pollution Remains of dead organisms are converted into fossil fuels (over millions of years!) Combustion of fossil fuels and wood releases CO2 Back to the Carbon Cycle Metabolism Using Water HOME Lightning and bacteria convert atmospheric nitrogen into nitrates (NO3) and ammonia (NH3) Back to the Nitrogen Cycle Protein Return to Atmosphere Production Plants use nitrogen molecules to make amino acids Back to the Nitrogen Cycle Nitrogen FixationConversion Consumers convert plant proteins to animal proteins Back to the Nitrogen Cycle Protein Production Waste Decomposers break down animal and plant matter into nitrogen compounds Back to the Nitrogen Cycle Conversion Return to Atmosphere Pollution Nitrogen compounds break down into gas and return to air Back to the Nitrogen Cycle Waste Nitrogen Fixation Runoff of nitrates in fertilizers enters groundwater and soil Back to the Nitrogen Cycle Protein Production Nitrous Oxide from burning fossil fuels falls as Nitric Acid in rainwater Back to the Nitrogen Cycle Waste Stand up to stretch, but don’t distract others around you!!! Click on the link below to learn about the Phosphorous Cycle :o) http://www.sumanasinc.com/webcon tent/animations/content/phosphoro uscycle.html