Correct: B. Sahara

Antarctica is technically the largest desert in the world. While people usually think of deserts as hot and sandy, a desert is scientifically defined as any region that receives less than 250mm (10 inches) of precipitation per year. Antarctica is a "polar desert," and some parts of it haven't seen rain or snow in millions of years. It is also the coldest, windiest, and highest continent on Earth.

Correct: A. Chile

The Atacama Desert is located in northern Chile, stretching between the Andes Mountains and the Pacific Ocean. It is widely considered the driest non-polar place on Earth, with some weather stations in the region having never recorded a single drop of rain in their entire history.

Correct: B. Antarctic

The Antarctic Desert is classified as the largest cold desert in the world, covering the entire continent of Antarctica with a vast expanse of ice that receives very little precipitation annually. Despite being covered in about 70% of the Earth's fresh water in the form of ice, the extreme cold prevents moisture from remaining in the air, making it as dry as many hot sandy deserts.

Correct: A. Great Victoria

The Thorny Devil is a unique, spiky lizard that is native to the arid desert regions of central and western Australia. Its body is covered in hard, sharp spines that serve as armor against predators, and it has a "false head" on its neck to trick attackers. They have an amazing adaptation for desert life where they can absorb water through their skin and move it to their mouths via tiny channels between their scales.

Correct: A. Namib

Deadvlei, or the "Dead Valley," is a famous white clay pan located near the iconic red sand dunes of Sossusvlei in the Namib Desert of Namibia. It is famous for the skeletal remains of hundreds of ancient camel thorn trees that died over 600 years ago when the climate changed and the water supply was cut off. The trees have not decomposed because the air is so dry that they have effectively been mummified by the sun.

Correct: D. USA

The Sahara Desert is roughly the same size as the entire United States (including Alaska and Hawaii) or the continent of Europe. It covers approximately 9.2 million square kilometers 3.6 million square miles, stretching across nearly a dozen countries in North Africa. Its massive size makes it the largest hot desert on Earth and the third-largest desert overall, after the cold deserts of Antarctica and the Arctic.

Correct: C. Mojave

The "Moving Stones" or "Sailing Stones" are a famous geological mystery found in the Racetrack Playa of Death Valley, located in the Mojave Desert of California. These rocks appear to move across the flat, dry lakebed on their own, leaving long tracks behind them despite no one ever seeing them move in person. Scientists discovered that the movement happens when thin layers of ice form after a rare rain, allowing the wind to push the rocks across the slippery surface.

Correct: D. Negev Desert

Petra (the Rose City) is located in Jordan in the Wadi Rum and Wadi Musa area of the Negev-adjacent arid terrain - technically in the Hashemite Kingdom's Wadi Arabah region adjacent to the Negev Desert.

Correct: A. Libyan Desert

The Libyan Desert (Eastern Sahara) contains ancient cave paintings at sites like Wadi Sura (Cave of Swimmers) in Egypt - rock art depicting humans swimming and other figures from a time when the region was much wetter.

Correct: D. Saudi Arabia

Saudi Arabia has approximately 95% of its land classified as desert or hyper-arid - the Rub' al Khali alone covers over 25% of the country and the An Nafud, Hejaz Desert, and other arid regions cover most of the remainder.

Correct: D. Badain Jaran Desert

The Badain Jaran Desert in Inner Mongolia, China, contains unusual permanent lakes at the base of its enormous dunes - fed by groundwater from distant mountains. The desert has some of the world's tallest stationary dunes reaching over 500 metres.

Correct: C. Liwa Crescent

The Liwa Crescent in Abu Dhabi, UAE, contains some of the world's largest barchans (crescent-shaped dunes) that can move significan'tly annually - the area is part of the northern Rub' al Khali.

Correct: C. Aralkum

The Aralkum is a newly formed desert on the former bed of the Aral Sea - one of the world's fastest-growing deserts created as the Aral Sea has shrunk dramatically since the 1960s due to Soviet irrigation diversions of the Amu Darya and Syr Darya rivers.