World’s Largest Desert

Описание: World’s Largest Desert

Deserts, wide drylands filled with sand, rocks, plants that have adapted to the dry nature of the desert, and occasional oasis here and there. These are often the features of deserts, and while there are a number of them, we will be discussing the world’s largest desert in this video.

The term Sahara is derived from the Arabic noun ar, which means desert. It is the world’s largest desert, covering nearly all northern Africa. It measures approximately 3,000 miles from east to west and 800 to 1,200 miles from north to south, with a total area of approximately 3,320,000 square miles. However, the actual area varies as the desert expands and contracts over time.

The Atlantic Ocean borders the Sahara in the west, the Atlas Mountains and the Mediterranean Sea in the north, the Red Sea in the east, and the Sahel in the south—a semiarid region that serves as a transitional zone between the Sahara in the north and the belt of humid savannas in the south.
The Sahara Desert is located on top of the African Shield, made of highly bent and bared Precambrian rocks. Because of the shield’s durability, later deposited Paleozoic rocks have remained horizontal and virtually unmodified.

Mesozoic deposits covered these formations throughout most of the Sahara, including the limestones of Algeria, southern Tunisia, northern Libya, the Nubian sandstones of the Libyan desert, and many of the key regional aquifers are identified with them.
These formations are also related basins and depressions from the oases of western Egypt to the chotts of Algeria in the northern Sahara. Downwarping of the African Shield in the southern Sahara formed enormous basins filled by Cenozoic lakes and seas, such as the ancient Mega-Chad.

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