Summative of Science

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.

Examples

burning of fossil fuels, the deforestation and combustion of biomass

Fisrt step

Nitrogen fixation

Second step

Nitrification

Third step

Assimilation

Fourth step

Ammonification

Fifth step

Denitrification

First step

Carbon moves from the atmosphere to plants.

second step

Carbon moves from plants to animals.

Third step

Carbon moves from plants and animals to soils.

Fourth step

Carbon moves from living things to the atmosphere.

Fifth step

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

Sexth step

Carbon moves from the atmosphere to the oceans.

First step

Weathering.

Second step

Fertilizer

Third step

Excretion and Decomposition.

Fourth step

Dissolved Phosphates.

Fith step

Geologic Uplift

Sexth step

Weathering.