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),...

This site has the experiences of real earth scientists. Investigate the experiences of a seismologist, topographic engineer, naval academy professor, oceanography major, meteorologist, and structural geologist.

In this lesson, learners learn about major landforms (e.g., mountains, rivers, plains, valleys, canyons and plateaus) and how they occur on the Earth's surface. They learn about the civil and geotechnical engineering applications of...