The Sahara desert is big enough to cover about 12 countries of Pakistan. The hottest desert in the world where sand is sand as far as the eye can see. It is difficult to find strays here.

 The Sahara desert is big enough to cover about 12 countries of Pakistan. The hottest desert in the world where sand is sand as far as the eye can see. It is difficult to find strays here. 

This desert is spread between ten countries of North and Central Africa. Once upon a time there was no desert but only water here. Where there were fish, sea snakes, and other aquatic life—but that was 5 to 10 million years ago when there was a passage of salty seawater. At that time, the water level in the oceans on Earth was quite high. But how do scientists know about this? So much so that they have found fossils of many sea creatures here, which testify that there was water in the Sahara before. But now the Sahara is dry, the sand flies here and there is not even a trace of green in the distance. 

If such a large area of the world is not green, then what is the use of it? Wait, let me tell you now. First, let's find out where are the largest and densest forests in the world? So the answer is Amazon forests which are spread in North America in Brazil, Colombo, Peru and other Latin American countries. These forests receive continuous rains. 

There are various types of animals and plants. But there is a problem with these forests that can destroy them. The soil of these forests is not fertile!! 

Here, if the trees are cut down, they grow back with difficulty. But why is it that despite having so many trees and plants, the soil here is not fertile? 

That's because the plants and trees here absorb more or less all the nutrients from the soil. Bacteria and fungi eat the dead plants. The remaining nutrients are absorbed by the roots of trees and plants. 

If the top layer of soil of these forests is removed by a few centimeters, only sand or barren soil will be found below. 

So where do these forests bring fertile soil? 

His answer is surprising. 

In fact, this fertile soil comes from the Sahara desert, thousands of miles away from these forests, across the Atlantic Ocean. 

Yes, the world's largest and lushest Amazon rainforest is provided by the world's driest and hottest Sahara desert. 

But how does this soil arrive? 

In the Sahara, there are huge storms that blow the fertile sand and soil of the Sahara, which contains phosphorus especially for plant growth, in the form of clouds. These sand clouds give their fertile soil to the Amazon forests thousands of miles away. 

NASA, which spends a significant part of its budget on Earth research, its satellites in space keep a detailed observation of the Earth. 

One of them is the CALIPSO satellite, which was launched in 2006 to observe dust particles and clouds in the Earth's atmosphere. 

The satellite images from 2007 to 2013 clearly show that millions of tons of dust clouds reach the Amazon forests from the Sahara every year. Surprisingly, the amount of phosphorus it contains is about 22,000 tons per year, which is almost as much as the Amazon forests lose each year due to rains and floods. 

The soil of the Sahara and the forest of the Amazon!! Two separate worlds but connected.