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 Sun Plants Rabbit Hawk Carbon Dioxide