[Free Registration/Login may be required to access all resource tools.] Discover how scientists learn about Earth's interior using seismic waves, meteorites, density, and the magnetic field. Additional resources are available for download.

Overview of the basic concepts behind evolution, such as gene variation and adaptations.[Free Registration/Login may be required to access all resource tools.]

This set of activities introduces students to the basic properties and measurements of soil water, and how the global distribution of soil moisture is monitored.

Simulate core sampling with this lesson. Students will see layers of Earth with this activity.

Use the scientific reasoning and critical thinking to take an in-depth look at the basics of biology.