If surface water is polluted, how does that affect the marine environment?

Explanation:

These pollutants have different environmental effects. Excess nutrients, for instance, may result in harmful algal blooms and hypoxia both in rivers and in coastal seas. Pathogens in rivers pose a threat to human health. ... Surface waters often suffer from the combined impact of multiple pollutants.

Explanation:

Surface water pollution is often caused by nutrients, pathogens, plastics and chemicals such as antibiotics, heavy metals and pesticides. These pollutants have different environmental effects. Excess nutrients, for instance, may result in harmful algal blooms and hypoxia both in rivers and in coastal seas. Pathogens in rivers pose a threat to human health. Chemical pollution can have toxic effects. Surface waters often suffer from the combined impact of multiple pollutants.

it provides an alternative energy pathway for the reaction to proceed.

a catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the course of the reaction.

catalysts increase the rate of reaction without being used up. they do this by lowering the activation energy needed. with a catalyst, more collisions result in a reaction, so the rate of reaction increases. different reactions need different catalysts.

a catalyst works by providing an alternative reaction pathway to the reaction product. the rate of the reaction is increased as this alternative route has a lower activation energy than the reaction route not mediated by the catalyst.

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