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In many natural waters, nitrogen and phosphorus are the least abundant nutrients available for plant life. Some waters that become polluted from agricultural runoff or municipal sewage become infested with algae. The algae flourish, and fish life dies off as a result. Describe how these events are chemically related.

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Nitrogen and phosphorus are the least plentiful nutrients available for plant growth in many natural waterways. Algae can grow in waterways that have been contaminated by agricultural runoff or municipal sewage. As a result, the algae thrive and the fish population declines. These events are chemically related as nutrient contamination can cause sections of water to be depleted or devoid of oxygen.

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01

Concept Introduction

Compounds are chemical compounds made up of two or more elements linked together chemically in a certain ratio.

02

Events related to each other chemically

Firstly, enrichments of the algal nutrients in water through organic effluents may selectively stimulate the growth of algalspecies producing massive surface growths or 'blooms' that in turn reduce the water quality and affect its use.That is, the pollution provides sources of nitrogen and phosphorus so the algae can grow.

As algal blooms grow, they deplete the oxygen in the water and block sunlight from reaching fish andplants.Such blooms can last from a few days to many months.With less light, plants beneath the bloom can die and fish can starve.

Therefore, nutrient pollution can create areas in water with little or no oxygen.

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