Coal, oil and gas are examples of ____ Burning fuels and oxygen create ____ dioxide and ____ oxide, which are harmful to the environment. Anything that can harm living organisms when too much of it is released into an ecosystem is called a ____. When pollutants and water mix, they form chemicals called ____. Polluted rain is called acid rain and can ____ plants, animals and buildings. The three categories of acidity are acid, base or ____. The opposite of acid is ____. When you mix an acid and a base you get a ____ substance. A special scale called a ____ can be used to measure the levels of acid and bases. Too much ____ can disturb many ecosystems.

Acid Rain

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