The formation of the Grand Canyon may be tied to a meteor strike that created another astonishing Arizona feature hundreds of centuries ago, a new study suggests. While the stunning northern Arizona ...

About 3.8 billion years ago, two massive canyons likely formed on the moon in a span of less than 10 minutes, according to new research. The extraordinary formations, each comparable in size to ...

The Canyon's Age Sparks Fierce Scientific Debate Scientists have spent over a century arguing about when the Colorado River ...

The Nechako Canyon often called Grand Canyon was formed by the once-raging Nechako River carving through a 300-meter volcanic ...