Humans Impact on Environment Tuesday September 24/26, 2013
-Biogeochemical Cycles: nutrient moved from the environment to organisms then back to the
environment. There are reservoirs of the nutrients in the environment
-By products of glucose breakdown= C02, water and energy
-Water cycle: cycling the water molecules, between bodies of water, from water to atmosphere
to bodies of water again or into the land through rain, etc
• Water in the atmosphere: clouds occur (vaporized water), changes from gas state to
water state based on temperature, and then falls to earth.
-Carbon Cycle: CO2 in atmosphere, taken in by trees changes to oxygen through
photosynthesis then produced for organisms that require oxygen.
• 2 sources of CO2 in earth’s atmosphere is cellular
respiration and burning of fossil fuels
-Phosphorus Cycle: moves through rocks and living organisms