The pH of water is a measure of its

Pure water is neutral, meaning it is neither an acid nor a base. Pure water has a pH of

Hard water contains high levels of

The first step in treating water from a river or lake is usually

Why is chlorine added to drinking water?

A drought is a long period of

The process of obtaining fresh water from salt water is called

Using water wisely to avoid wasting it is called

The amount of one substance in a certain volume of water is called its

Smoke and exhaust from cars and factories create the form of water pollution called

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