There is a”big eye” in the Sahara Desert, which is 700 miles long, and the”eyeball” is as long as 100 miles long.
If you look at the southwestern part of the Sahara Desert in Africa from outer space, you will be surprised to find that there is an”eye” staring at you. This”eye” is the famous”Eye of Africa” (or”Eye of the Sahara” ), some people call it”Earth Eye” or”Geological Eyeball”. It has a very rounded concentric structure, plus an eyebrow-shaped mountain set in the north. Looking down from the sky, it looks like a huge Eyes are looking into space.
But if you are on the earth, in this”Eye of Africa” position, then you will never see the””Eyes”, even if you pass by here by plane, it is difficult to see that it looks like an eye, because this”eye” is so big that it can only be seen in space.
This peculiar”Eye of Africa” is located in the southwest of the Sahara Desert In Mauritania, the diameter of the round”eyeball” is nearly 50 kilometers, and the entire”eye” is 340 kilometers long, which means that the”eyeball” of the”Eye of Africa” is 100 miles long. , And the total length of the”eyes” is nearly 700 miles.
This is really a very rare terrain, so how does it Formed? Because the shape of its”eyeball” is very round, similar to a large crater, the terrain was considered to be formed by a large meteorite collision in the early days, but after investigation, geologists believe that this is not the case, because the center here is quite flat, and There is no crater shape with a high outer periphery and a lower middle, and no geological evidence such as high temperature impact lava and meteorites have been found. Therefore, geologists rejected the claim that this place is a crater.
Some people also think that this may be a giant volcano, but like Like the crater, the terrain and geology here also do not support the theory of volcano formation, because if it is a volcano, its central part will be very high, and the place where the lava protrudes can easily form a steep mountain, like Mount Fuji, but here The terrain is relatively low in the middle, and the internal terrain is quite flat, and the undulations are not large. The average elevation is only 400 meters. There are some mountains on the periphery, but they belong to natural mountains and are not formed by volcanoes. No volcanic crater is found in the center. , And no geological evidence of volcanic lava flow was found, so the theory of volcanic formation was also denied.
Later, geologists comprehensively judged that the topography of this place It should be a kind of”Richardt structure”, that is, the result of the terrain uplift of the crustal movement and the erosion of external forces at the same time. Field investigations revealed that the concentric marks in the”Eye of Africa” were Paleozoic quartzite, which was harder and less susceptible to erosion, because of this Rock-like rocks are not easy to weather, so they are well preserved, but sedimentary rocks and other rocks have moved beyond the Paleozoic quartzite under the action of water current, sunlight, and wind, resulting in a concentric terrain similar to eyeballs. .
But why is this”Eye of Africa” so round , So huge, there is no convincing explanation yet. So the reason for the formation of the terrain here is still a mystery.