Environmental Science
Warming in the stratosphere is mainly caused by:

Absorption of ultraviolet radiation by ozone
Release of latent heat energy during condensation
Chemical reactions between ozone and chlorofluorocarbons
Frictional heating caused by meteorites

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Environmental Science
What is the cause of the Exxon Valdez?

a ship which wrecked on the coast of India
a plane which crashed and caused death of human life
Oil Tanker which sank in 1989 along the coast of Alaska and marine life seriously affected.
none of these.

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