Humans have only inhabited Earth for a short part of its existence. An online resource explains how scientists use clues from rocks and fossils to piece together information about Earth prior to humans. The online instruction includes...

Rising sea levels, strong storms, melting ice ... who or what is to blame? Scholars browse the website in preparation for a class discussion or debate about whether human activity is causing climate change. They gain a balanced...

Without the greenhouse effect, Earth would not be inhabitable. A thorough online resource describes the greenhouse effect and how it occurs. The source highlights the different types of gases that work together to absorb the sun's...

This site from USGS provides several activities to help understand the interrelationships among earth surface processes, ecological systems, and human activities. Also included are links to new findings and programs concerning Earth...

Use this site to explore real scientific data relating to the atmosphere. With this information you can gather evidence, test theories, and come to conclusions. Click on the data examples to view a full scale version.

Use this site to explore real scientific data relating to the hydrosphere. With this information you can gather evidence, test theories, and come to conclusions. Click on the data examples to view a full scale version.