As viewed from space, the Earth appears beautiful and serene. As you well know, however, here standing on Earth, it's complicated! Complex, that is. And, it's constantly changing. Often changes on Earth happen so slowly it would be...

In this lesson, students will understand that temperature changes can cause density changes in water and in air.

Find a large collection of internet resources organized around our home planet, Earth. Links to places to go, people to see, things to do, teacher resources, and bibliographies.

Everything in Earth's system can be placed into one of four major subsystems: land, water, living things, or air. These four subsystems are called "spheres." Specifically, they are the "lithosphere" (land), "hydrosphere" (water),...

Using a surficial features map, students see the connections between those features and other Earth systems. They will consider the interactions of the geosphere, hydrosphere, biosphere, and atmosphere.

Imagine our weather if Earth were completely motionless, had a flat dry landscape and an un-tilted axis. This, of course, is not the case; if it were, the weather would be much different. The local weather that impacts our daily lives...

Understand heat transfer in the atmosphere using this study guide.

The plate tectonics and other features of the Earth's lithosphere are explained and illustrated. Has links to definitions of the magnetosphere, atmosphere, and hydrosphere.

See how atmospheric pressure affects air masses, which in turn affects the weather on Earth.

This survey of the planets includes all the basics, size, mass, atmosphere, length of day, and the like. It features interactive activities and learning exercises and compares all of the planets in colorful tables.

This site from NASA lists and defines global wind patterns. It features a graphic of these patterns and a self-test with answers.

Site recounts how X-rays were discovered as well as who discovered them. Offers graphics, links to facts on this topic, a quiz, and teacher resources.