The dominant rock type in the Yellowstone region is rhyolite, and that is very rich in silica. As hot water circulates underground, it can dissolve that silica and bring it to the surface, where it is ...

The US Department of Justice has dismissed veteran federal prosecutor Maurene Comey, who worked on high-profile cases ...

More than 60 dead in Iraq after shopping mall fire; Fatal blaze at Massachusetts assisted living facility claims 10th victim; ...

The White House issued an executive order to raise entrance fees for foreign visitors to U.S. national parks at the same time the U.S. Supreme Court’s decision made park staff once again vulnerable to ...