1. MATTER CYCLES
between biotic, abiotic reservoirs

2. water cycle

3. •Evaporation from bodies of water • Condensation into clouds, fog
• Precipitation
What about the biotic?
• Water, H, & O atoms needed by, stored in, and moved through organisms as part of the water cycle
ex: used in photosynthesis, produced in respiration,
transpired in great quantities by plants

4. carbon
cycle

5. • Vast stores of C in
atmosphere, oceans as CO2
• Taken up by plants in photosynthesis
• Stored as organic molecules (ex: fructose - C6H12O6) in tissues of organisms

6. • Organic molecules used by organisms in respiration
• C released as CO2 into atmosphere, oceans

7. • Also taken up by aquatic
animals for shell building
(CaCO3)

8. nitrogen cycle

9. • N2 is abundant in atmosphere
a form not usable by most organisms
• Solution? Converted first by bacteria in roots of legumes (peas, beans, nuts)
nitrogen-fixation
• Further converted to NOx by soil bacteria
ammonification, nitrification
• Taken up by plants, used to build proteins, DNA
• Still other bacteria return N2 to the atmosphere denitrification

10. phosphorous cycle

11. phosphorous cycle
• Largest reservoir is on land in rocks, soil minerals and ocean sediment
no atmospheric source
• As rock weathers, phosphate slowly released to soil
low availability limits plant growth
needed to build proteins, DNA
• Erodes with soil into rivers, lakes and oceans, settles to floor