A resource that is limited and we can not make more of is called a

he mixture of smoke, fog, and chemicals is often referred to as ______________.

The main cause of air pollution is

________________ is a dangerous mineral to humans and can often cause problem if you eat too much fish that has lived in a contaminated area.

The main source of our drinking water is

What percentage of the earth is covered in freshwater?

The introduction of harmful materials into the environment is called

DDT is a dangerous ______________ that was used to kill bugs and was found to be harmful to animals and people.

The ____________ is a government agency that serves us by forming laws and regulations to protect the environment.

You can help to solve the problem of land pollution by reducing, reusing, and

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