Cycles. Water, Carbon, Nitrogen, Oxygen and Phosphorus

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Slide 1

Cycles

Water, Carbon, Nitrogen Oxygen and Phosphorus

Slide 2

Water (hydrologic) Cycle

Plants absorb water from the soil

Transpiration and respiration return water to the atmosphere

Precipitation returns water to the soil

Nonmetal oxides in the atmosphere combine with water to form acid rain

Slide 3

Slide 4

The Carbon Cycle

Carbon is fixed by plants

6 CO2 + 6 H2O  C6H12O6 + 6 O2

Carbon is given off by consumers

C6H12O6 + 6 O2  6 CO2 + 6 H2O

Organisms containing carbon form fossil fuels

Burning fossil fuels releases carbon

2 C8H18 + 25 O2  16 CO2 + 18 H2O

Slide 5

Carbon Cycle

Slide 6

Slide 7

Arctic Carbon Cycling

Slide 8

The Nitrogen Cycle

Bacteria fix nitrogen from the air

Consumers and producers incorporate nitrogen into their tissues

Nitrogen can be fixed industrially from the air

Production of ammonia

Decay processes return nitrogen to the air

Nitrogen from fertilizers may contaminate water sources

Slide 9

Slide 10

Aquarium Nitrogen Cycle

Slide 11

The Oxygen Cycle

Oxygen is produced by photosynthesis

6 CO2 + 6 H2O  C6H12O6 + 6 O2

The largest chemical process on earth!

Oxygen is sequestered by respiration

C6H12O6 + 6 O2  6 CO2 + 6 H2O

Slide 12

6 CO2 + 6 H2O  C6H12O6 + 6 O2

C6H12O6 + 6 O2  6 CO2 + 6 H2O

Slide 13

The Phosphorus Cycle

The element phosphorus (P)is released in the form of ionic phosphate (PO43-)

Weathering of rock, mining, some detergents and fertilizers

Phosphate is taken up by plants and fungi

Consumers absorb phosphate from plants

Decomposers return phosphate to soil

Phosphate leaches into water supply