Review
In fact, objectively speaking, the space for human beings to survive on the earth is not large, if you look at the earth from space, you will find that 70% of the area of the earth is covered by azure oceans, and the remaining 30% are not all land for human survival, which also has deserts, mountains, grasslands, forests, stone forests and other landforms to further compress the living environment of human beings.
In particular, deserts, according to data released by geologists, one-tenth of the land area on Earth are covered by yellow sand, the largest of which is called the "Sahara Desert", which is located in northern Africa and covers an area of about 9,400,000 square kilometers.
Combining the total areas of the U.S. states, it is about the size of the Sahara Desert.
In the face of the vast and far-reaching Sahara, many scientists are keen to explore the secrets hidden under the desert, if the sand of the Sahara is dug up, what is under it? There is still no answer to this question, but the pace of scientific research will never stop.
Origins of the Sahara Desert
According to geologists, the vast Sahara Desert was not covered by yellow sand in ancient times, it is a warm oasis full of life, and the reason why the Sahara Desert presents the bare yellow sand that we can see with the naked eye is that it has undergone nearly 12,500 years of geological changes.
In Greek mythology, the Sahara Desert was caused by Helios's son Faeto, whose arrogant ambassador accidentally had an accident while driving a sun car, causing the fiery chariot to burn the earth in a chaotic manner, displacing the people, the original oasis being squeezed dry, and the sand becoming the owner of the land.
The origin of the myth is not empty, in fact, 7,000 years ago, there were really ancient people living in the Sahara.
There is a riverbed that they have reclaimed, and they cultivate, raise and live a full life in this blessed grassland. However, after the advent of natural disasters, the humid climate of the Sahara Desert gradually disappeared, and the ancients could not survive and were forced to migrate long distances.
Of course, this natural disaster was not caused by the same hand of the god of light, Fare, and the real cause of the degradation of the Sahara Desert oasis was affected by the periodic changes in the tilt of the Earth's axis of rotation.
Although the Earth's axis has been stabilized under the moon's gravity, there are still subtle movements that can cause huge consequences over time. Geologists observe that the tilt angle of the Earth's axis is now 23.43°, but 12,500 years ago, this value should be 23.14°.
Due to the smaller and smaller inclination angles, the repeated reduction of direct sun exposure in the Sahara, and the beginning of the monsoon in northern Africa at that time, it may be difficult for the Sahara to have a single rainfall for 10-20 years.
By 5,000 years ago, we would no longer see the lush oases of the Sahara, where a large number of ancients were forced to migrate, and this has become an extremely barren land.
Secrets of the Sahara Desert
Scientists know that the first thing to do to unearth the secrets buried in the Sahara Desert is to measure its depth.
The depth of the Sahara, which covers an area of 9.4 million square kilometers, is uneven due to years of windy winds, with the deepest points where sand accumulation is evident at about 320 meters and the depths of nearly 90 meters in shallow places.
If we look at the satellite imagery, it's a yellow sky, as if all the sand in the world is piled up here. Someone tried to count the amount of sand in the Sahara Desert, and finally came to the conclusion that this should be more than the stars of the universe.
As for the secrets buried deep in the Sahara Desert, we can only say that it is full of infinite possibilities.
Geologists have found a large number of oil wells in the Sahara Desert, and beneath this sand dune there are riverbeds, mountains, plateaus, and even an extinct volcano nearly 3500 meters above sea level.
Some people say that the desert is the place where miracles are born, and that is because the sand is all-encompassing, it seems to be a new kind of active life, a new form that does not follow the laws of nature as the laws of existence.
Then a friend asked, if the Sahara Desert is hollowed out, will the treasure in its depths belong to you? It's a bit of a fantasy, and I don't know if there's treasure in the depths of the Sahara Desert, but I can assure you that if you really have the perseverance to dig it all the way down, you'll soon be exposed to the hard rocks.
In fact, the Sahara Desert is not entirely made of sand, but more of a geological structure is rocky layers, plateaus, and vast plains covered in gravel.
However, as we said above, in the history of a thousand years ago, there were traces of the life of the ancients, and if you continue to dig the rock layers, you may be able to see the remains of prehistoric and other ancient civilizations.
epilogue
For some time, many people have been working to dig up the secrets of the deep desert, and some people have proposed to empty the sand of the Sahara Desert, or to change the desert climate here by planting trees and afforestation, so as to expand the living space of human beings.
If it were a regular desert, the idea might have really come true over time, but unlike the Sahara, some deserts are destined not to die.
Moreover, everyone seems to be mistaken, the purpose of our afforestation is not to eliminate the desert, but to change the harsh desert environment, to prevent soil desertification or the frequent arrival of sandstorms.
The Sahara Desert has long been fixed through historical changes, and it may one day move elsewhere due to the movement of plates or the tilt of the Earth's axis, but this time is destined to be a long and endless time, perhaps 10,000 years later, or 100,000 years later.
From the perspective of modern people, it is really a bit of a fantasy to eliminate this desert. Sand itself is a gift from nature, and we should coexist peacefully with it, using the value of sand itself to achieve the progress of human civilization, which is the right way.