Hills of music billow in the creeks...
While other melodies are heard
In the gorges of the lateral canyons.
The Grand Canyon is a land of song."
- John Wesley Powell
UNITED STATES The Grand Canyon is one of the most studied geologic landscapes in the world. It offers an excellent record of three of the four eras of geological time, a rich and diverse fossil record, a vast array of geologic features and rock types, and numerous caves containing extensive and significant geological, paleontological, archeological and biological resources. It is considered one of the finest examples of arid-land erosion in the world. The Canyon, incised by the Colorado River, is immense, averaging 4,000 feet deep for its entire 277 miles. It is 6,000 feet deep at its deepest point and 15 miles at its widest. Its great biological diversity can be attributed to the presence of five of the seven life zones and three of the four desert types in North America.
Current rank: 20
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