Biosphere videos (i.e., Biosphere videos):
1. NASA: The Water Cycle | 1:23: Good and no dialogue. Longish, but short enough for the classroom.
2. Biosphere 1 | 1:48: Nice time-lapsed cloud film. No dialogue. Not high-def. A bit too long for the classroom, but one can show a few minutes.
3. Reveal Earth's Atmosphere | 4:56: A National Geographic production---but in Scottish. Too long for the classroom. Local file: local link: biosphere_videos.html.
   File: Biology file: biosphere_videos.html.