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...
Nature Conservancy
Nature Conservancy: Planet Earth: Deserts and Aridlands
The desert areas in the United States that this organization is working to protect are portrayed through photographs and videos, showing the beauty of the landscapes and the diversity of life forms there.