Because the Grand Canyon ranges from 1,200 feet at the canyon's western bottom to more than 9,100 feet on the North Rim, it supports a variety of plant and animal life indigenous to both desert and mountain environments.  Because the Grand Canyon ranges from 1,200 feet at the canyon's western ...

Grand Canyon attracts the attention of the world for many reasons, but perhaps its greatest significance lies in the geologic record preserved and exposed here. The rocks at Grand Canyon are not inherently unique. Similar rocks are found throughout the world. What is unique about the geologic record at ...