Desert 9 T01

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The world’s deserts can be divided into five types—subtropical, coastal, rain shadow, interior, and polar. Deserts are divided into these types according to the causes of their dryness.

The Sahara desert ecoregion covers the hyper-arid central portion of the Sahara where rainfall is minimal and sporadic. Vegetation is rare, and this ecoregion consists mostly of sand dunes ( erg, chech, raoui), stone plateaus ( hamadas), gravel plains ( reg), dry valleys ( wadis), and salt flats. It covers 4,639,900 square kilometres (1,791,500sqmi) of: Algeria, Chad, Egypt, Libya, Mali, Mauritania, Niger, and Sudan. [12] Sand and ground temperatures are even more extreme. During daytime, the sand temperature is extremely high: it can easily reach 80°C (176°F) or more. [22] A sand temperature of 83.5°C (182.3°F) has been recorded in Port Sudan. [22] Ground temperatures of 72°C (161.6°F) have been recorded in the Adrar of Mauritania and a value of 75°C (167°F) has been measured in Borkou, northern Chad. [22]a b c White, Kevin; Mattingly, David J. (2006). "Ancient Lakes of the Sahara". American Scientist. 94 (1): 58–65. doi: 10.1511/2006.57.983.

Important cities located in the Sahara include Nouakchott, the capital of Mauritania; Tamanrasset, Ouargla, Béchar, Hassi Messaoud, Ghardaïa, and El Oued in Algeria; Timbuktu in Mali; Agadez in Niger; Ghat in Libya; and Faya-Largeau in Chad. Holl, Augustin F.C. (2009). "Coping with uncertainty: Neolithic life in the Dhar Tichitt-Walata, Mauritania, (ca. 4000–2300 BP)". Comptes Rendus Geoscience. 341 (8–9): 703–712. Bibcode: 2009CRGeo.341..703H. doi: 10.1016/j.crte.2009.04.005. Archived from the original on 18 November 2018 . Retrieved 24 May 2021. Unique hunters emerge in the desert at night, representing stealth and survival. Owls and bobcats play critical roles in the desert’s balance.

Kaʻū Desert – an area of desertification in Hawaii, due to the acid rainfall caused by the nearby Kīlauea volcano.