The chemical makeup of mineral inclusions preserved in impact glass hints at the site of a missing impact crater.

When you arrive at the Kino Gem & Mineral Show, you'll stumble upon hundreds of different vendors. It'll be hard to miss the one where a baby donkey and goat greet you!

Rivers began pumping weathered material into the sea about a billion years after Earth formed, suggesting continents may have gotten an early start.

Hubbard, who first joined the USGS as a postdoc, is part of the agency’s Earth Mapping Resource Initiative (Earth MRI).