It is the largest and most famous desert on Earth. Only Antarctica is bigger, but we do not think of an ice-covered continent as a desert in the typical sense. Most people associate a desert with the scorching sun, lack of rain, and sand, lots of sand. Only sand all around. In terms of size, Sahara covers the territory that equals half of Russia or the entire Brazil.

Do you know that rich deposits of gas and oil are discovered there? The Sahara Desert has sand dunes as high as 160-180 meters. They are higher than a building of 70 stories. It is the Sahara Desert.

But what is behind the arid sandy landscape? Why sand? Why so much sand? Where did it come to begin with? Has the Sahara always been like it? Imagine, that not long ago, relatively recently, these vast territories were booming with life. But then something went wrong…