Conversation so far:
what city in arizona is the grand canyon
The nearest cities to the Grand Canyon South Rim are Tusayan, Williams and Flagstaff.
What is the air quality like in the Grand Canyon
Grand Canyon National Park enjoys some of the cleanest air in the United States.
What kind of plants are found in the Grand Canyon
Coyote willow, arrowweed, seep willow, western honey mesquite, catclaw acacia, and exotic tamarisk are the predominant species along the Colorado River.
What kind of animals are found in the Grand Canyon
Some of the notable species living in the Grand Canyon include the mountain lion, California condor, Grand Canyon rattlesnake, black widow spider, big horn sheep, and 22 species of bats

Question: How many people visit the canyon each year
Self-contained rewrite: How many people visit the Grand Canyon each year