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Summative of Science

Phosphorous cycle

Fith step

Geologic Uplift

Dissolved Phosphates.

Excretion and Decomposition.

Fertilizer

Weathering.

Carbon cycle

Sexth step

Carbon moves from the atmosphere to the oceans.

Carbon moves from fossil fuels to the atmosphere when fuels are burned

Carbon moves from living things to the atmosphere.

Carbon moves from plants and animals to soils.

second step

Carbon moves from plants to animals.

First step

Carbon moves from the atmosphere to plants.

Nitrogen cylce

Fifth step

Denitrification

Fourth step

Ammonification

Third step

Assimilation

Second step

Nitrification

Fisrt step

Nitrogen fixation

How are humans affecting the natural course of the biogeochemical cycles? Why? Provide 3 examples to explain your point of view.

Examples

burning of fossil fuels, the deforestation and combustion of biomass

Human activities have greatly increased carbon dioxide levels in the atmosphere and nitrogen levels in the biosphere. Altered biogeochemical cycles combined with climate change increase the vulnerability of biodiversity, food security, human health, and water quality to a changing climate.