EVERYDAY SCIENCE

Detailed explanation-1: -Human activities can contribute excess amounts of nitrogen and phosphorus into water. Therefore, human causes of eutrophication include the use of agricultural fertilizers. Other causes include sewage and aquaculture, which is the growing or farming of fish, shellfish and aquatic plants.

Detailed explanation-2: -Nutrients, such as nitrogen and phosphorus, occur naturally, but most of the nutrients in our waterways come from human activities and sources-fertilizers, wastewater, automobile exhaust, animal waste.

Detailed explanation-3: -When manure or commercial fertilizers enter surface water, the nutrients they release stimulate microorganism growth. The growth and reproduction of microorganisms reduce the dissolved oxygen content of the water body. Without sufficient dissolved oxygen in surface water, fish and other aquatic species suffocate.

Detailed explanation-4: -Some common human causes of eutrophication include agricultural fertilizers, aquaculture, the commercial livestock industry, sewage, and industrial waste products. Eutrophication possesses long-reaching environmental consequences resulting in the loss of biodiversity and ocean acidification.

Detailed explanation-5: -Nutrient pollution is the process where too many nutrients, mainly nitrogen and phosphorus, are added to bodies of water and can act like fertilizer, causing excessive growth of algae. Nutrients can run off of land in urban areas where lawn and garden fertilizers are used.