People. _______1. ( live) in and around the Grand Canyon for at least 12,000 years. Today Native American peoples such as the Havasupai _____2. (dwell) just outside the boarders of Grand Canyon National Park. About five million tourists a year also _____3. (drop) by the park to hike the canyon trails, ride mules along the ridges, climb the steep rocks, and stand on the canyon’s edge to peer down at the rockin’ view.
The Grand Canyon ______4. (carve) over millions of years by the Colorado River that flows through its base. The floor of the canyon _____ 5. (has ) a diverse landscape, featuring dried up desert areas that can heat up to 120ºF as well as forests where temperatures sometimes _____6. (drop) to minus 20ºF.