The substances mankind has thrown away have polluted the lakes, rivers, and even ____________.

An estimated 10%, or 100 million people on earth do not have access to clean_________________________.

The main problem with drinking untreated water is that it can carry _______________ that makes people very sick.

Rivers and streams can be_______________ by poorly managed dumping sites around them.

Chemical fertilizers are much more dangerous to the water supply than ____________ fertilizers, like manure.

Chemical fertilizers run into lakes and streams causing eutrophication, an overgrowth of ____________.

If heavy metals, such as lead and mercury, end up in our lakes many animals will die.

Radioactive waste, both stored above ground and underground , can be dangerous if there are leaks. This leak would contaminate both animals and humans.

Huge amounts of plastic dumped into the oceans by ships have made it dangerous for birds and oher ____________animals.

Heat can also act as a pollutant to the rivers and oceans because it changes the ________________of the water.

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