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Water pollution is caused by excess fertilizer used in agriculture.
Rain carries this excess fertilizer to streams and lakes. The algae in

these streams and lakes grow excessively because of the fertilizer.

When they die, they sink to the bottom and decay. The decaying

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process uses oxygen that other animals and plants need to survive.

Another kind of pollution is land pollution. It is caused by the

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garbage people produce. Landfills are filling quickly every day. As
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more garbage piles up in landfills the waste material seeps into the
ground.

Eventually, the soil becomes polluted and causes diseases in both

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humans and animals. No one wants to live in a polluted environment .

Never throw waste into an ocean or lake. Use recycled paper napkins

and reusable plastic containers. In addition, for short trips, ride a

bicycle rather than a car.

landfill

5 oxygen : colorless gas in the air which is necessary for life
6 landfill : an area built up by garbage
7 seep : to flow slowly through small holes or spaces
8 environment : the conditions that surround someone or something 19