How much fresh water is in the United States? It's a tough question, since most of the water is underground, accessible at ...

The Cooperative National Geologic Map offers a complete and detailed look at the bedrock and fault systems of the continental United States. The first geological map of the United States was published ...

As climate change produces ever more heat waves, how many homes in the U.S. lack adequate cooling? Who's most vulnerable to lethal temperatures, and exactly where do they live? A researcher at the ...