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Earth’s Natural Cycles Water (H2O) Cycle Carbon Dioxide/Oxygen (CO2/O2) Cycle Nitrogen Cycle Water (H2O) Cycle • Water cycle-the movement of water from Earth’s surface into the atmosphere and back to the surface again. • Condensation • Precipitation • Evaporation • Transpiration Water -H20- Cycle • is the movement of water in the environment • 75% of the Earth’s surface is water. • • • Most of the Earth’s fresh water is found in frozen polar ice caps and glaciers. 1% (of the 75%) is freshwater All the water on Earth today is the same water that was here billions of years ago. • Condensation-water vapor turns back into liquid water in the process of condensation. • Precipitation - any form of water (rain, sleet, snow, etc…) that falls from the clouds • Evaporation- process by which a liquid changes into a gas. • Transpiration- The loss of moisture from the leaves of plants. Carbon Dioxide/Oxygen (CO2/O2) Cycle • Carbon Dioxide- An odorless gas in the air which is made out of carbon and oxygen – CO2. • Carbon dioxide is stored mostly in oceans (90% of oxygen in the atmosphere comes from photosynthesis of microscopic plantlike organisms in the ocean) and the atmosphere – it is found in bodies of dead organisms and is a by-product of combustion. • Carbon dioxide and oxygen stay in balance through the process of photosynthesis and respiration • Green plants- take in carbon dioxide and release oxygen Carbon Dioxide/Oxygen Cycle Oxygen Sun Plants Rabbit Carbon Dioxide Hawk Nitrogen Cycle -- the cycle in which nitrogen gas is changed into forms of nitrogen that plants can use . -- 78% of the gas in the atmosphere is Nitrogen When we talk about the Nitrogen Cycle we use words like…. ….fungus (mushrooms), bacteria, decay and decompose/decomposers, breaking down animal waste and plant matter, once living organisms, composting/compost piles and bins Nitrogen Cycle Sun Plants Rabbit Hawk Decomposers pictures from Google search