1. Kosma, G., 20151

2.  A desert is a barren area of land where little precipitation occurs and consequently living conditions are hostile for plant and animal life. The lack of vegetation exposes the unprotected surface of the ground to the processes of denudation. About one third of the land surface of the world is arid or semi- arid. This includes much of the polar regions where little precipitation occurs and which are sometimes called "cold deserts".precipitationdenudationarid Kosma, G., 20152

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4. 4 Major deserts on earth

5.  The Sahara (Arabic: الصحراء الكبرى ‎, a ṣ - Ṣ a ḥ rāʾ al- Kubrā, 'the Great Desert') is the largest subtropical hot desert and third largest desert after Antarctica and theArctic.Arabicsubtropicalhot desertdesertAntarcticaArctic  Some of the sand dunes can reach 180 metres (590 ft) in height. [2] The name comes from the plural Arabic language word for desertsand dunes [2]Arabic language Kosma, G., 20155

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10. Fauna in cold desertsFauna in hot deserts Kosma, G., 201510

11. a) farmersor b) breeders (nomads) Kosma, G., 201511

12. Kosma, G., 201512

13. Kosma, G., 201513