Clouds and weather associated with them
http://www.weatherwizkids.com/weather-clouds.htm
Hadley cells and atmospheric circulation
Precipitation at the lead edge of a cold front–animation
http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/af/frnts/cfrnt/prcp.rxml
Precipitation caused by cold fronts and warm fronts
Tree line on mountains-photographs
Type into your browser: images for tree line on mountains photos