Q: What has a bigger impact on water quality, natural events or human activity?


Read this paragraph and choose the correct option from the provided answers:

Natural events, like storms, volcanic eruptions and earthquakes can cause major changes in water quality. But human-caused contaminants have a much greater impact on the quality of the water supply. Water is considered polluted either when it does not support a human use, like clean drinking water, or a use for other animals and plants. The overgrowth of algae, known as an algal bloom , can result from the runoff of fertilizer into bodies of water. This excess of nutrients allows the algae to grow beyond control, bring harm to the rest of the ecosystem.

 Choices:

- water quality

- all of the above

- natural events

- human activity


A:
human activity