Nitrogen Cycle(1) Nitrogen gas (N2) in

atmosphere

Ammonium (NH4

+)Nitrites (NO2

-)

Nitrates (NO3

-)(3c)Decomposers

(bacteria & fungus)

(3a) Nitrates “assimilated” into plant roots

(3b)Plants & Animals

(4)Denitrifying

Bacteria

(1)

(3c)

(3a)(3b) (4)

(2) Nitrogen “fixed” by bacteria into Ammonium & Nitrates

(2)

Carbon Cycle(1) CO2 in atmosphere

(2) CO2 “fixed byplants throughphotosynthesis

(3) Animals eat plants

(3c) Plants/Animalsdecompose

(detritus)

(3b) Cellular Respiration

(3d) Burning)

(1)

(2)

(3a)

(3b)

(3c)

(3d)

Phosphorous Cycle

(2b) Phosphates in rock

(2a) Phosphates in plants/animals

(1) Phosphates in soil

Phosphates in soil

(2a)

(1)

(2b)

Water Cycle

(1) Surface Water(liquid)

(2) Evaporation(Liquid Gas)

(3) Condensation(Gas Liquid/solid)

(4) Precipitation(Liquid/solid)

(4a) Recharge/runoff(Liquid)

(1)

(2)

(3)

(4)

(4a)