THE WATER, PHOSPHOUR AND SULPHUR CYCLES IN NATURE: As their name suggests, cycles unite plants with animals and human beings constantly. What is the biosphere made up of. Biochemical cycles. The Water cycle. Phosphor is rare but extremely important element. The Phosphor Cycle. Sulphur is an essential nutrient. The Sulphur Cycle. Though we may not realize it, we live our lives closely linked with Nature. Were it not for the continuous renovation of natural cycles, we simply could not survive.