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Rain that contains more acid than normal.

The height of an object or point in relation to sea level or ground level.

The envelope of gases surrounding the earth or another planet.

an instrument measuring atmospheric pressure, used especially in forecasting the weather and determining altitude.

the degree of compactness of a substance.

A form of oxygen that has tree oxygen atoms in each molecule instead of the unusual two.

A brownish haze that is a mixture of ozone and other chemicals, formed when pollutants react with each other in the presence of sunlight.

a substance that pollutes something, especially water or the atmosphere.

The amount of force pushing on an area.

a black powdery or flaky substance consisting largely of amorphous carbon, produced by the incomplete burning of organic matter.

Water in a form of gas.

The state of Earth's atmosphere at a particular time and place.

78% nitrogen and 21% oxygen and 1% other gases