Question

write a short note on Sahara desert

Answer 1

The desert comprises much of North Africa, excluding the fertile region on the Mediterranean Sea coast, the Atlas Mountainsof the Maghreb, and the Nile Valley in Egyptand Sudan. It stretches from the Red Sea in the east and the Mediterranean in the north to the Atlantic Ocean in the west, where the landscape gradually changes from desert to coastal plains. To the south, it is bounded by the Sahel, a belt of semi-arid tropical savannaaround the Niger River valley and the Sudan Region of Sub-Saharan Africa. The Sahara can be divided into several regions including: the western Sahara, the central Ahaggar Mountains, the Tibesti Mountains, the Aïr Mountains, the Ténéré desert, and the Libyan Desert.

For several hundred thousand years, the Sahara has alternated between desert and savanna grassland in a 41,000 year cycle caused by changes ("precession") in the Earth's axis as it rotates around the sun, which change the location of the North African Monsoon. It is next expected to become green in about 15,000 years (17,000 AD). There is a suggestion that the last time that the Sahara was converted from savanna to desert it was partially due to overgrazing by the cattle of the local population.[

Answer 2

Sahara is from the Arabic word for desert, itself apparently derived from a word meaning 'yellowish-red'. So 'the Sahara desert' would be literally 'the Desert desert'. (Kind of like how the River Avon is the River River, or the La Brea tar pits are the The Tar tar pits.)
The Sahara is the world's largest hot desert and one of the harshest environments on the planet. It is third largest desert overall after Antarctica and the Arctic, which are cold deserts. ... This is the image many people have of the Sahara: a vast sea of sand dunes
The Sahara Desert is about 9,000,000 square kilometers (3.5 million square miles) in size. It has been both larger and smaller at different times
Sahara is a vast desert covering large parts of many countries which include from East to West, Egypt, Sudan, Libya, Chad, Tunisia, Algeria, Mali, Niger, Morocco, Western Sahara, Mauritania, and a small part of Eritrea.