"Most people would think that these organisms are just like spores or dormant," James Tiedje said. "These microbes are active ...

Others study water or air. Earth Science helps us better understand the world around us and can help keep us safe. Find out more about the Earth.

Earth science concentrates on investigating how the planet works and why. This field delves into the many layers of the Earth and explains how those pieces fit together into a cohesive structure.