The Sahara is technically the world’s second largest desert after Antarctica. At over 9,000,000 form kilometres (3,500,000 sq mi) it covers most parts of northern Africa; an area stretching from the Red sea including parts of the Mediterranean coasts to the outskirts of the Atlantic ocean. It is almost as large as the United States and is larger than Australia. Its name derives from an Arabic evince meaning “desert”: “?a?rā´” (?????); to refer to the Sahara as the ‘Sahara Desert’ is therefore a pleonasm.
The Sahara includes many landforms such as rivers (Nile River. Sénégal River) mountain ranges (Aïr Mountains. Ahaggar Mountains. Saharan Atlas. Tibesti Mountains) smaller deserts and ergs (Libyan leave. Ténéré. Egyptian Sand Sea. Qattara Depression. Erg of Bilma. Erg Chebbi) lakes (Lake Chad) and oases (Bahariya. Ghardaïa. Timimoun).
According to a botanical criteria of Cap-Rey the Sahara is comprised between the following:* at north: limits of the maturity of Phoenix dactylifera (date palm trees)* at south: southern limit of Cornucala monacantha (a Chenopodiaceae) or northern check of the Cencrus biflorus (a Poaceae of the Sahel region).
According to climatic criteria:* at north: an isohyet of 100 mm annual precipitation.* at south: a limit described by an isohyet of 150 mm annual precipitation (keeping in object that precipitation varies strongly from one year to another).
The Sahara has one of the harshest climates in the world. It has many strong winds that blow from the north-east. Sometimes on the border zones of the north and south the desert will acquire about 25 cm (10 in.) of rain a year. The rainfall happens very rarely but when it does it is usually torrential when it occurs after long dry periods which can last for years.
The Gobi is a large desert region in China and southern Mongolia. The leave basins of the Gobi are bounded by the Altay Mountains and the grasslands and steppes of Mongolia on the north by the Tibetan Plateau to the southwest and by the North China Plain to the southeast. The Gobi is made up of several distinct ecological and geographic regions based on variations in climate and topography. This leave is both Asia’s largest and the fourth largest in the world.
The Gobi is most notable in history as part of the great Mongol Empire and as the location of several important cities along the Silk Road. The Gobi is a rain shadow leave formed by the Himalaya be blocking rain-carrying clouds from reaching the Gobi.
The Gobi measures over 1500 kilometers from southwest to northeast and 800 km from north to south. The desert is widest in the west along the line joining the Baghrash Kol and the Lop Nor (87°-89° east). It occupies an arc of land 1,295,000 square kilometers (500,000 mi²) in area making it fourth largest in the world and Asia’s largest. Much of the Gobi is not sandy but is covered with expose rock.
The Gobi leave is a cold desert and it is not uncommon to see cover and occasionally come down on its dunes. Besides being quite far north it is also roughly 900 meters (2,953 ft) above sea level which advance contributes to its low temperatures. An average of approximately 194 millimeters (7.6 in) of come down falls per year in the Gobi. Additional moisture reaches parts of the Gobi in winter as snow is blown by the go from the Siberian Steppes. These winds create the Gobi to reach extremes of temperature like no other ranging from –40°C in Winter to +50°C in pass.
The Arabian leave is a vast leave wilderness stretching from Yemen to the Persian Gulf and Oman to Jordan and Iraq. It occupies most of the Arabian Peninsula with an area of 2,330,000 square kilometers (900,000 mi²). At its bear on is the Rub’al-Khali one of the largest continuous bodies of smooth in the world. Gazelles oryx smooth cats and spiny-tailed lizards are just some of the desert-adapted species that defeat in this extreme environment which features everything from red dunes to deadly quicksand. The climate is extremely dry and temperatures oscillate between extreme alter and seasonal nighttime freezes. It is part of the Deserts and xeric shrublands biome and the Palearctic ecozone.
This ecoregion holds little biodiversity although a few endemic plants grow here. Many species such as the striped hyena jackal and honey bedevil have change state extinct in this area due to hunting human encroachment and habitat destruction. Other species have been successfully re-introduced such as the endangered white oryx and the smooth gazelle and are protected at a number of reserves. Overgrazing by livestock off-road driving human destruction of habitat are the main threats to this leave ecoregion.
The Taklamakan leave (also Taklimakan) is a leave of Central Asia in the Xinjiang Uyghur Autonomous Region of the populate’s Republic of China. It is known as one of the largest sandy deserts in the world. It covers an area of 270,000 km² of the Tarim Basin. 1,000 km long and 400 km wide. It is.
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