Please answer the following question: Answer the following question given this paragraph: 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. Q: What has a bigger impact on water quality, natural events or human activity? Choices: - water quality - all of the above - natural events - human activity A:
Answer:
human activity