Atmospheric Structure
   Explains the thermal structure of the Earth's atmosphere.
   http://meted.ucar.edu/hao/aurora/txt/x_t_1_0.php

Climate
   An introduction to climate. Explains the difference between weather and climate.
   http://weathereye.kgan.com/cadet/climate/

Geography4Kids.com: Atmosphere
   Looks at the different levels of the atmosphere, how it moves, and how it's changing.
   http://www.geography4kids.com/files/atm_intro.html

Layers of the Earth's Atmosphere
   Tells the names of the levels of the atmosphere, and how come they're there.
   http://www.windows.ucar.edu/tour/link=/earth/Atmosphere/layers.html&edu=elem

The Atmosphere
   Looks at different parts of the atmosphere, and has information on what makes up the atmosphere.
   http://liftoff.msfc.nasa.gov/academy/space/atmosphere.html

The Earth's Atmosphere
   Describes the composition and layers of the atmosphere.
   http://csep10.phys.utk.edu/astr161/lect/earth/atmosphere.html

Weather Summary
   Learn about weather patterns and discover how our climate is changing. Try your hand at being a storm chaser in a hands-on Web activity.
   http://www.learner.org/exhibits/weather/

What is Weather?
   Explains the difference between climate and weather.
   http://www.econet.org.uk/weather/whatis.html