13 The Grand Canyon The Grand Canyon is one of the world's great mostly flat. It is covered with a forest of oak, natural wonders. It extends about 277 miles spruce, and pine trees. A few bushes and through northern Arizonu. The Colorado small pines cling to the walls of the cliffs. River begins in the Rocky Mountains of Bushes dot the canyon floor. Many different northcra Colorado. It flows ſur 1.490 miles animals live in the Grand Canyon, including through the base of the canyon it carved. It mountain lions, bighorn sheep, mule deer, and eventually empties into the Gulf of Califomia, bobcats. which is a part of the Pacific Ocean. It took this river billions of years to form the Grand The Grand Canyon was the site of two Canyon. Slowly, it wore away the rock, different mountain ranges that rose and exposing ancient rocks and fossil specimens. were worn away during the long period of Rocks at the base are two billion years old, its existence. At times, ancient seas flowed among the oldest found on Earth. in from the oceans. The rock walls contain remains of prehistoric plants and animals The Grand Canyon is more than a mile deep from both land and sea. For scientists in some places. In width, it varies from four studying Eurth's Datural history: the Grand to eighteen ailes. The top of the canyon is Canyon is a giant laboratory Check Your Understanding 1. Which of the following statements wxiuld not be relevant information about the Grand Cityou? a. The Grand Canyon was first explored by John Wesley Powell. t. The Colorado River can pick up rocks as large as cars, c. The Colorado River keeps digging deeper into the canyon floor d. There are canyons in several states, 2. From the context of the passage, what is the best meaning of prehistoric? a. older than 200 years b. older than the history of man's life on Earth o before 1.500 CE. d older than your parents 3. Which of the following sentences is a topic sentence? a. The Grand Canyon is one of the world's great natural wonders. b The top of the canyon is mostly flat. c. The rock walls contuan remains of prehistoric plants and animals fratr both land and scal. d. At times, ancient sens flowed in from the can 4. What is the oldest age of rocks in the Grand Canyon? 3.4.6 billion years old c. 2,000 years old b. two billion years old d. 200 years old 14 De Che Roses 23 $5036 Daily Wilpa Pontic Beading 10 2