【US】Grand Canyon National Park South Rim Arizona: colorful natural wonder 美国大峡谷国家公园 - 地球上最壮丽的红色沟壑

The Grand Canyon is a steep-sided canyon carved by the Colorado River in Arizona, United States. The Grand Canyon is 277 miles (446 km) long, up to 18 miles (29 km) wide and attains a depth of over a mile (6,093 feet or 1,857 meters).
Nearly two billion years of Earth's geological history have been exposed as the Colorado River and its tributaries cut their channels through layer after layer of rock while the Colorado Plateau was uplifted.
President Theodore Roosevelt was a major proponent of preservation of the Grand Canyon area and visited it on numerous occasions to hunt and enjoy the scenery.
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