Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions from 33 to 38.

One of the most breathtaking natural wonders in the world is the Grand Canyon, located in the state of Arizona, USA. The canyon stretches for about 446 kilometers and is up to 1,857 meters deep. It was carved by the Colorado River over millions of years and is famous for its stunning rock formations, colorful layers, and unique geological history. Scientists estimate that the rocks in the Grand Canyon are nearly two billion years old, making it one of the oldest geological formations on Earth.

Visitors from all over the world come to admire the beauty of the canyon. They enjoy hiking along its trails, rafting in the Colorado River, or simply taking in the spectacular views from observation points. The Grand Canyon National Park was established in 1919 to protect this incredible site, and in 1979, it was recognized as a UNESCO World Heritage Site.

Apart from its breathtaking scenery, the Grand Canyon has a wide range of wildlife, including bighorn sheep, mountain lions, and over 400 species of birds. The canyon's climate varies significantly with elevation, as temperatures at the rim are much cooler than those at the bottom.

The Grand Canyon is a protected national park, ensuring that its beauty and natural state are preserved for future generations.

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