Geologists know there’s no better place to see Earth’s history laid bare than on the Colorado Plateau. Prescott College professors Kurt Refsnider and Kaitlyn Boyle make the subject come alive for their students in a novel way—from the seat of a bicycle.
A new study from the U.S. Geological Survey shows uranium in Pigeon Spring, north of the Grand Canyon, is likely not related to a nearby mine. The research is part of a larger effort to understand the impacts of uranium mining in the region.
The Grand Canyon is running short on sand. Sediment that once washed down the Colorado River to form beaches is now trapped behind Glen Canyon Dam. For two decades river managers have released artificial floods to rebuild the beaches … but it’s not clear if the river has enough sand for these experiments to work in the long run. That’s what scientists want to find out.