Take a look at the Earth from the inside out. This site shows the different layers of the earth with an explanation of the rocks and materials in each layer. Includes a quiz on the structure of Earth.

Instructional module focusing on Earth's atmosphere. Discussion includes major components, layers, air pressure, and scientific monitoring of the atmosphere. Site also includes an interactive practice quiz and links relating to the topic.

A video and a short multiple-choice quiz on the composition of and the layers in Earth's atmosphere.

Explore the layers of the Earth through this interactive quiz.

A slideshow and a short multiple-choice quiz on the rock surface of the Earth, its water, and the gas layers that surround it.

Identify the layers of the atmosphere through this interactive quiz.