Question 2 of 21

Where will you find the deepest canyon on Earth?

... Arizona's Grand Canyon may be majestic, but it's not the world's largest gorge. That honor goes to Tibet's Yarlung Zango Grand Canyon. At 17,490 feet (5,300 meters) deep and 310 miles (500 kilometers) long, it's both longer and deeper than its Arizona counterpart.

Question 3 of 21

How many people visit the Grand Canyon in Arizona each year?

... The Grand Canyon was declared a national park in 1919, and now welcomes more than 5 million visitors every year. While the canyon itself is large, the Grand Canyon National Park spans more than a million acres as of 2012.

Question 4 of 21

What term is used to describe very narrow, deep canyons?

... Slot canyons are often just a few feet wide, yet can extend hundreds of feet down. Climber Aron Ralston became trapped in a Utah slot canyon in 2003, and was forced to amputate his own arm to survive. He wrote a book about his experience, which was later made into the film "127 Hours" (2010).

Question 5 of 21

The largest canyon in the solar system isn't here on Earth, but on this planet.

... Valles Marineris on Mars formed billions of years ago as the planet cooled. At more than 2,485 miles (4,000 kilometers) long, 372 miles (600 kilometers) wide, and 6 miles (10 kilometers) deep, it's the largest known canyon in the solar system.

Question 6 of 21

What river flows through Arizona's Grand Canyon?

... The Colorado River flows west through the Grand Canyon. It averages 300 feet (91.4 meters) wide and 100 feet (30.5 meters) deep along its length.

Question 7 of 21

Where will you find the Colca Canyon, known for its condor population as well as its significance to the Inca people?

... Colca Canyon remains one of Peru's top tourist attractions. Visitors flock to the area to view the natural beauty of the canyon and to learn about the local Incan traditions.

Question 8 of 21

Which Hawaiian island is home to Waimea Canyon, known for its red lava beds and ever-changing colors?

... Kauai's Waimea Canyon measures just 14 miles (22.5 kilometers) long, 1 mile (1.6 kilometers) wide and 3,600 feet (1,097 meters) deep. What it lacks in size it more than makes up for in style, thanks to its rainbow of natural colors.

Question 9 of 21

Visitors flock to the Verdon Gorge in France, which is named for this beautiful feature.

... The Verdon Gorge gets its name from its brilliant turquoise-green river. Glacial deposits at the river's source help to give it its color.

Question 10 of 21

Fact or fiction: The Grand Canyon started to form only about a million years ago, and reached its current depth so quickly because of flash floods.

... Fiction: The oldest rocks at the base of the Grand Canyon are about 2 billion years old. The canyon itself is relatively young, and formed slowly over the past 5 to 6 million years.

Question 11 of 21

What term describes a river that is situated within the walls of a canyon?

... Rivers that flow through canyons are known as entrenched rivers because they can't meander or change their course. The Colorado River is an example of an entrenched river.

Question 12 of 21

Which country is home to Fish River Canyon, the largest canyon in Africa?

... Fish River Canyon is one of the biggest tourist attractions in Namibia. The Fish River that gives the canyon its name can transform from a slow trickle in the dry season to raging rapids during the rainy summer season.

Question 13 of 21

How wide is Arizona's Grand Canyon at its widest point?

... The Grand Canyon measures 18 miles (29 kilometers) wide at its widest point. At 277 miles (446 kilometers) long and 1,500 miles (5,000 kilometers) deep, it's the largest canyon in the United States.

Question 14 of 21

What unusual feature is Glen Canyon best known for?

... Glen Canyon is home to a popular site known as Horseshoe Bend, where the Colorado River curves in a horseshoe shape around a sandstone escarpment. The bend is just a short hike from Lake Powell.

Question 15 of 21

Scenes from "The English Patient" (1996) were filmed a Mides Canyon, located in this country.

... "The English Patient" was filmed at Tunisia's Mides Canyon. The canyon covers more than 2,000 square miles (5,180 square kilometers), and its varied supply of minerals gives it a colorful appearance.

Question 16 of 21

Where will you find Zhemchug Canyon, the world's largest underwater canyon?

... Zhemchug Canyon in the Bering Sea drops down more than 1.6 miles (2,600 meters), and stretches 62 miles (100 kilometers) across.

Question 17 of 21

Fact or fiction: Mexico's Copper Canyon is actually made up of six different canyons within the Sierra Madre.

... Fact: Copper Canyon gets its name from its copper-green walls, and is made up of six different canyons within the Sierra Madre. The canyon is home to the Tarahumara people, and was profiled in the book "Born to Run" by Christopher McDougall.

Question 18 of 21

You'll find this slot canyon, known for its flowing sandstone walls, near the town of Page, Ariz.

... Antelope Canyon sits on Navajo land near the town of Page, Ariz. Thanks to beautiful natural lighting and sandstone walls that appear to flow, the canyon remains a top spot for photographers and tourists alike.

Question 19 of 21

Visitors to Utah's Zion Canyon can view one of the largest examples of this in the world.

... Zion Canyon is home to the Kolob Arch. At 287.4 feet (87.6 meters) long, its the second largest natural arch in the world, after the Landscape Arch at Arches National Park.

Question 20 of 21

What term is used to describe a canyon that is open on one side?

... Box canyons are open on one end, and were once used as natural corrals by Native Americans and early settlers.

Question 21 of 21

Fact or fiction: Tectonic activity helped to form the Grand Canyon in Arizona.

... Fact: Tectonic activity, or shifting plates on the Earth's crust, helped to form the Colorado Plateau. Millions of years later, the flow of the Colorado River cut into the plateau to form what we now know as the Grand Canyon.

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