This article explores how nitrogen becomes available to organisms and what changes in nitrogen levels as a result of human activity means to local and global ecosystems. Nitrogen is one of the ...

Natural cycles and decomposition - Edexcel Materials such as carbon, nitrogen and water are recycled in the ecosystem. When organisms die, decomposition will recycle minerals and nutrients back to ...

The carbon cycle is the biogeochemical cycle focused on carbon and how it is sequestered in and moves between different reservoirs in the Earth system. Natural gradients across surface ocean ...

Fire is a natural, vital component of most western forest ecosystems. In dry forest types like ponderosa ... Dead trees serve as important wildlife habitat and contribute to the nutrient cycle, and ...