American Museum of Natural History
What's the Big Deal About Water?
It may seem simple, but water is one of the most unique substances on Earth. An interactive online lesson describes its properties and importance in so many different situations. Learners interact with the lesson to learn the role water...
American Chemical Society
American Chemical Society: Explore Chemistry: Water and Chemistry
Explore water's unique properties in the activities here. Includes ideas for starting a chemistry club, ideas for Earth Day, articles, and videos.
University Corporation for Atmospheric Research
Ucar: Introduction to the Atmosphere
A detailed overview of the Earth's atmosphere, with explanations about atmospheric properties, the structure of the atmosphere, its four layers, atmospheric processes, energy heat transfer, conduction and convection, and radiation. All...