A 4.2 magnitude earthquake struck near Great Falls on Thursday, briefly rattling residents and raising questions about why earthquakes occur in the region.

Critical minerals in the state include antimony, arsenic, barite, beryllium, cesium, fluorspar, graphite, lithium, manganese, ...

Spearfish Canyon Nature Area in Lead, South Dakota is that rare natural wonder that delivers maximum beauty with minimum fuss – the perfect recipe for a laid-back day trip that feels like a vacation.

This illustrated geologic timescale of Earth focuses on the landscapes, flora and fauna of the West, drilling into the region’s deep history.

As the U.S. prepares for another lunar landing, one woman who spent years working in Flagstaff could soon set foot on the ...