In this experiment, students create a model of the water cycle and learn about its crucial role in moving water around the Earth.

Find out how much of the water on Earth is actually usable by humans, and where the rest of it is located. Learn where our water comes from and why it never runs out. Click Home to access the site in Spanish.

Kids learn about the carbon cycle and how this nutrient travels through the ecosystem to sustain life on Earth.

Kids learn about the nitrogen cycle and how this nutrient travels through the ecosystem to sustain life on Earth.

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...