The long-term deposition of organic material in sediments on the ocean floor is a key process in the global carbon cycle. The question of whether, from a chemical perspective, the deposited material is more similar to marine algae or the microorganisms that decompose the algal biomass is largely unresolved. The long-term deposition of organic material in sediments on the ocean floor is a key process in the global carbon cycle. The question of whether, from a chemical perspective, the deposited material is more similar to marine algae or the microorganisms that decompose the algal biomass is largely unresolved. Earth Sciences Environment Phys.org – latest science and technology news stories