INSIGHT UPSC QUIZ

ANS. (A) 
The Grand Canyon is a steep-sided canyon carved by the Colorado River in the United States in the state of Arizona. It is contained within and managed by Grand Canyon National Park, the Hualapai Tribal Nation, and the Havasupai Tribe. President Theodore Roosevelt was a major proponent of preservation of the Grand Canyon area. A number of processes combined to create the views that we see in today’s Grand Canyon. The most powerful force to have an impact on the Grand Canyon is erosion, primarily by water (and ice) and second by wind. Other forces that contributed to the Canyon’s formation are the course of the Colorado River itself, volcanism, continental drift and slight variations in the earth’s orbit which in turn causes variations in seasons and climate.