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In page Geomicrobiology:

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In the oceanic crustal aquifer, the largest aquifer on Earth,[2] microbial communities can impact ocean productivity, sea water chemistry as well as geochemical cycling throughout the geosphere. The mineral make-up of the rocks affects the composition and abundance of these subseafloor microbial communities present.[3] Through bioremediation some microbes can aid in decontaminating freshwater resources in aquifers contaminated by waste products.