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Temperatures on the North Rim are generally lower than those on the South Rim because of the greater elevation (averaging 8,000 feet or 2,400 metres above sea level).

Heavy rains are common on both rims during the summer months.

These rock layers record much of the early geologic history of the North American continent.

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).The major geologic exposures in the Grand Canyon range in age from the 2-billion-year-old Vishnu Schist at the bottom of the Inner Gorge to the 230-million-year-old Kaibab Limestone on the Rim.There is a gap of about a billion years between the 500-million-year-old stratum and the level below it, which dates to about 1.5 billion years ago.However, the Grand Canyon is known for its visually overwhelming size and its intricate and colorful landscape.Geologically, it is significant because of the thick sequence of ancient rocks that are well preserved and exposed in the walls of the canyon.Weather conditions during the ice ages also increased the amount of water in the Colorado River drainage system.


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