In geology, even small layers can tell big stories. But figuring out the origins of such small layers can be a challenge, ...

The Oregon Trail was a challenge, to say the least, but its most dangerous crossing has evolved into one of the most ...

President announces all-of-government effort to protect ecosystems, boost recreation access on public lands day after ...

Giant, large-scale eruptions can have more serious impacts. One such event contributed to the demise of the dinosaurs 66 ...

The U.S. Geological Survey said it and other agencies were monitoring the situation and would issue additional alerts "as needed." ...