A Whole Lot About Ozone.

Nearly 20 years ago, British researchers discovered a gaping ozone hole over Antarctica, which fueled concerns that human-made chemicals were gnawing away at Earth's shield against harmful UV radiation. "The Ozone Depletion" page from the U.S. Environmental Protection Agency offers everything from animations of the ozone hole to measurements of UV radiation reaching the ground in different parts of the United States. Teachers will find backgrounders on the causes and possible consequences of ozone depletion.