Use words and phrases from the table to fill the gaps in the text below.

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• Humans need water to survive. However, trash and chemicals can get thrown in to the ocean and lakes or water sources. They also affect fish and other animals in water. When Harmful chemicals get into the water, they have a harmful effect on the water cycle. Natural causes of water pollution include algae blooms and volcanoes. Humans also causes water pollution through trash and waste water from factories.