Long ago, the Grand Canyon wasn’t a land of plunging ravines and gaping gullies, but the site of towering mountains, not dissimilar to South America’s Andes of today. They are known as the ...

Two Grand Canyon-size features on the far side of the moon were likely formed in about 10 minutes after an unknown object slammed into the moon 3.8 billion years ago.

Two Grand Canyon-size features on the far side of the moon were likely formed in about 10 minutes after an unknown object slammed into the moon 3.8 billion years ago.

In the 19th century, many people believed that landscapes like the Grand Canyon were shaped by volcanoes and earthquakes. But one American geologist named John Newberry had different ideas.

The extraordinary formations, each comparable in size to Earth’s Grand Canyon, are hidden on the far side of the moon — the side that always faces away from Earth — near the lunar south pole ...

The Grand Canyon is the biggest canyon on earth: 277 miles long, 10 miles wide, and a mile deep. It contains some of the oldest exposed rock on earth, Precambrian Vishnu schist, formed 1.7 billion ...

Formed over thousands of years of erosion caused by hydrothermal activity, water and other natural forces, the Grand Canyon of the Yellowstone is the primary attraction in the Canyon Village area ...

The Grand Canyon. A fresh analysis of rocks exposed in the side of the canyon is changing an 80-year-old textbook model and our understanding of the Cambrian Explosion.

By Ashley Strickland, CNN (CNN) — About 3.8 billion years ago, two massive canyons likely formed on the moon in a span of less than 10 minutes, ...