Tropical Deserts
Tropical deserts are characterized by their hot and dry climate, with very little rainfall. These deserts are found in regions near the equator, where the atmospheric conditions create a lack of moisture in the air. Some of the well-known tropical deserts include the Sahara Desert in Africa, the Arabian Desert in the Middle East, and the Atacama Desert in South America.

Atacama Desert
The Atacama Desert is located in northern Chile, along the Pacific coast of South America. It is known as one of the driest places on Earth, receiving very little rainfall throughout the year. The desert is characterized by its vast expanse of barren landscapes, salt flats, and sand dunes. The extremely arid conditions in the Atacama Desert are a result of the cold Humboldt Current that flows off the coast, preventing the formation of rain clouds.

Arabian Desert
The Arabian Desert is located in the Arabian Peninsula and covers parts of Saudi Arabia, Yemen, Oman, and the United Arab Emirates. It is the largest continuous sand desert in the world, with vast stretches of sandy plains, dunes, and gravel plains. The desert experiences extremely high temperatures during the day and very low temperatures at night. The Arabian Desert is known for its unique sand formations, such as sand seas and sand sheets.

Gobi Desert
The Gobi Desert is located in northern China and southern Mongolia. It is a cold desert, rather than a tropical desert, as it experiences extremely cold temperatures during the winter months. The Gobi Desert is characterized by its vast expanses of gravel plains, rocky mountains, and sand dunes. It receives very little rainfall, and most of the precipitation occurs during the summer months.

Kalahari Desert
The Kalahari Desert is located in southern Africa, covering parts of Botswana, Namibia, and South Africa. It is a semi-arid desert, with a mixture of desert and savannah vegetation. The Kalahari Desert experiences a hot climate, with high temperatures during the day and cooler temperatures at night. It receives more rainfall compared to other deserts, with the majority of the precipitation occurring during the summer months.

Conclusion
Out of the given options, the Gobi Desert is not a tropical desert. It is a cold desert situated in northern China and southern Mongolia. The Gobi Desert experiences extremely cold temperatures during the winter months and is characterized by gravel plains, rocky mountains, and sand dunes.