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Ozone depletion is primarily caused by human activities. The main effect of ozone depletion is an increase in UV-B rays reaching the earth's surface.

Causes : chlorofluorocarbon (CFCs), halons, and other compounds deplete the ozone layer. These chemicals are found in cleaning agents, aerosols, insulating foam, and refrigerants. CFCs and halons break down into chlorine and bromine which in turn destroy the ozone layer.

1. CFCs released into environment rises up to stratosphere
2. Sunrises break the CFCs up, releasing Chlorine
3. Chlorine react with ozone O3 and destroy ozone
4. More reaction cause more depletion