How a disagreement with a Scottish lord over westward expansion, a cache of gunpowder, and the future of enslaved labor ...

Explore how North America is changing as its deep cratonic root thins and pieces are dripping into the Earth's mantle.

Colorado River states have weeks remaining to resolve deep divides over how to manage the river for years to come, officials at a water conference in southwestern Colorado said Friday. “We have a real ...

Seismic mapping of North America has revealed that an ancient slab of crust buried beneath the Midwest is causing the crust ...