Long hailed as one of the seven wonders of the natural world, the GrandCanyon remains one of Earth's greatest ongoing geological spectacles.
Approximately 65 million years ago what is now called the ColoradoPlateau was uplifted 1.5 miles above sea-level. The Colorado Riverbegan carving its way down through the layers of rock 5-6 million yearsago.
After millions of years of erosion, today the canyon is nearly one mile(1,500m) deep and nearly 18 miles (29km) across at its widest points.
The result: One of the most spectacular gorges in the world, withspectacular rock walls revealing 2 billion years of Earth's geologichistory.
