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Lower
Atmosphere

the troposphere * air composition * greenhouse effect * oxidation & chemistry * fire * ozone smog

Greenhouse effect

The Earth is a greenhouse. Why?
Flash animation and explanation in easy words. Part of 'Environment for young Europeans'.

The greenhouse effect is ...
Explanation of the Greenhouse Effect in text images and an interactive flash animation - from: EPA Kids Site (US Environm. Protection Agency)

Is the greenhouse effect a bad thing?
The answer and another nice animation in Dr. Art's Guide to the Planet