The Water Cycle Water cycles between atmosphere, land, and ocean. Condensation - gas to liquid Precipitation - liquid or solid falls Evaporation - liquid to gas Transpiration - evaporation from plant leaves Runoff – water running off land Groundwater – water under ground Percolation (infiltration) – water soaking into ground
The Carbon Cycle Combustion - burning (combining C w/ O 2 ) Cellular respiration – breathing out CO 2 Photosynthesis – plants take in CO 2 and give off O 2 Decomposition – bacteria give CO 2 off when they break down dead organisms.
The Nitrogen Cycle N 2 gas is “fixed” into ammonia (NH 3 ) by bacteria. Plants absorb N and animals take in N when they eat plants. (makes muscle) Ammonia from waste is converted back to nitrite and then nitrate by bacteria.