1 of 10

Slide Notes

DownloadGo Live

Deserts of the world

Published on Jun 01, 2016

No Description


Deserts of the world

White Sands - white desert
White Sands, having 442 total square kilo­me­ters of dune fields, is the world's largest surface deposit of gypsum. Unlike other desert sands, it is cool to the touch, due to the high rate of evap­o­ra­tion of surface moisture and the fact that the sands reflect, rather than absorb, the sun's rays.

Photo by M.McCraw

The Eye of Sahara
The Richat Struc­ture in Mau­ri­ta­ni­a, also known as the Eye of the Sahara, was in­ter­pret­ed as an asteroid impact struc­ture, but no evidence for shock meta­mor­phism has been found. Today sci­en­tists believe that it is a huge (40 km in di­am­e­ter) and deeply eroded geologic dome.

Photo by dno1967b

Which con­ti­nent has the lowest pre­cip­i­ta­tion rate?
Antarc­ti­ca is tech­ni­cal­ly a desert, av­er­ag­ing just 166 mm (6.5 in) of pre­cip­i­ta­tion per year. Only some fringe coastal areas have a tundra climate with a short summer av­er­ag­ing above freez­ing, and much higher pre­cip­i­ta­tion.

Circular objects in desert?
Agri­cul­tur­al fields. The circular shape of fields is char­ac­ter­is­tic of center pivot ir­ri­ga­tion. These fields are ap­prox­i­mate­ly 0.6 mile (1 kilo­me­ter) in di­am­e­ter. Lighter colors indicate fields that have been har­vest­ed recently or just planted.

Photo by dsearls

Aus­tralian Gibson Desert is named after Alfred Gibson. Who was he?
A man who got lost in the desert. The Gibson Desert was named by explorer Ernest Giles after a member of his party, who became lost and pre­sum­ably died in the desert. There is almost nothing known about Alfred Gibson apart from his ap­pear­ance.

Photo by spelio

How much of Aus­tralia coast­line is de­ser­tous?
Only 140 miles (out of 21,262). More than 40% of Aus­trali­a's land is clas­si­fied as desert, but almost all of it is located inland. The Great Sandy Desert is the only one to extend to the coast, forming the long sweep of the Eighty Miles Beach (which is actually 140 miles long).

Photo by mary fly

In which country is Berber the official lan­guage?
In Morocco. The Berber language is ancient and has 2200 years of written tra­di­tion. In 2011 Berber became a con­sti­tu­tion­al­ly official language of Morocco, after years of per­se­cu­tion (under the policy of Ara­biza­tion). There is a movement among speakers of the closely related va­ri­eties of Northern Berber to unite them under a standard lan­guage.

Which desert is the driest in the world? (non-po­lar)
Atacama. The Atacama is the driest of all deserts, with some places having recorded no rain in living memory. It extends along the Pacific coast, forming a huge strip of arid, hostile beach. The average rainfall in the Antofa­gas­ta region is 1 mil­lime­ter (0.04 in) per year.

Photo by Miguel Vera

How does the land­scape of Sahara desert mainly look like?
It is rocky. Most of the Sahara consists of rocky hamada; ergs (large areas covered with sand dunes) form only about 20% of the total area.