The mountains were formed around 1.7 billion years ago amid ... the base layer of rock that is located at the lowest part of the Grand Canyon today. Directly on top sit several other layers ...

"Scroll Down through History" displays the layers of rock exposed within the Grand Canyon and shows when in earth's history they formed. The region where the Grand Canyon now lies begins to shift ...

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 ...

Since the Grand Canyon of Mars is a rift valley and was not formed by water, this module focuses on processes that alter a planet's surface in the absence of flowing surface water such as uplift, ...

If you're planning a trip to Arizona's Grand Canyon, don't forget to check out this nifty little pool in its depths. But be ...

Small groups of hunters likely traipsed the Grand Canyon region near the end of the last Ice Age, searching for mountain goats, bison, and wild plants. The first recorded group to live in the ...

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 Vikos Gorge, a wonder of the natural world in Greece, is known as the "Greek Grand Canyon" because of its cliffs and ...

The Grand Canyon reminds us constantly that we are merely ... The whole earth story is on display here, right back to the rocks that formed when the molten planet cooled, before life and evolution ...