1. Biogeochemical Cycles
9/26/16
Biogeochemical Cycles
Objective: I will describe the processes involved in several biogeochemical cycles on Earth.
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2. What words do you know that include the word “cycle”?
What does the word “cycle” mean?

3. Cycles on Earth reservoir- a place where matter or energy is stored
cycle- group of processes in which matter and energy move through a series of reservoirs
Length of time spent in each reservoir can vary
from hours to millions of years

4. Nitrogen Cycle nitrogen is used to build the proteins that build cells
vital for all life on Earth
nitrogen moves from the air to soil, from soil to plants and animals, and back to air again

6. Identify two nitrogen reservoirs in the cycle.
Atmosphere
Animals
Soil
Plants

7. Carbon Cycle
Carbon moves through Earth’s spheres through the carbon cycle
Short-term:
Plants convert CO2, from the atmosphere into O2 through photosynthesis
Organisms release CO2 back into the atmosphere through respiration
Long-term:
carbon is stored in the geosphere in a type of rock called a carbonate

9. Water Cycle
movement of water from the atmosphere to Earth’s surface and back to the atmosphere
Evaporation, condensation, precipitation, and transpiration