Why has the Sahara Desert become the most biologically difficult desert to survive? What exactly has

The Sahara Desert is the largest desert in the world, located in northern Africa, on the Tropic of Capricorn. It is a place that many explorers want because of the abundance of resources in the Sahara Desert. But this place is not suitable for living things, and there are many reasons for this.

I think the most important thing is because its climate is too harsh. <>

The Sahara Desert covers an area of more than 9 million square kilometers, which is about the size of China, and the Sahara Desert is bordered by the Atlantic Ocean in the northwest, the Mediterranean Sea in the southwest, and borders the Arabian Peninsula. The Sahara Desert was formed millions of years ago, mainly because the area of the ocean was decreasing, which led to the weakening of the summer monsoon, so that an arid climate was formed, and the gradual reduction of the size of the oases also led to the formation of deserts at an accelerated rate. <>

There are also very few creatures in the Sahara Desert, as most of them are almost impossible to survive here. The local precipitation is scarce, the climate is dry, and because it is near the Tropic of Capricorn, the sun shines for a long time, receives more heat, so it is also very hot, and the temperature is high during the day, and at night due to more yellow sand, the heat dissipation speed is faster, so that the local night temperature drops quickly, and the temperature difference between day and night is very large, which also makes the creatures unsuitable for survival. There is also very little precipitation, but a lot of evaporation, which also makes it impossible for most organisms to survive.

In fact, there are some organisms in the Sahara Desert, such as some heat-tolerant and drought-tolerant plants, some birds, and there are also many ectotherms, such as crocodiles, etc., as well as some birds, which also form a food chain. <>

In the 50s of the 20th century, many experts discovered a lot of oil, natural gas, iron ore and other mineral resources in the Sahara Desert through technical means, which also surprised the world. Finally, it is hoped that we will be able to make the most of the resources of the Sahara Desert without destroying the local biodiversity.

Because there is less water on the desert, and there is very little food for living things, and it is located in a remote area, there is little precipitation; He experienced the erosion of very severe natural disasters.

It is because the environment of the Sahara Desert is very harsh, so it is difficult for organisms to survive. It has taken a long time to get to where we are now.

Because the Sahara Desert not only has very long sunshine hours, but also very hot, it is difficult for ordinary creatures to survive in such an environment, and the Sahara Desert has also experienced many years of wind and sun and desertification to become what it is now.

The natural environment of the Sahara Desert is very harsh, and after the vicissitudes of the Sahara Desert, there is sand everywhere in the pan. Organisms are difficult to survive.

The Sahara Desert is the largest desert in the world, located in Africa, and was formed 2.5 million years ago. With an area of 9,320,000 square kilometers and a very harsh climate, this place is not suitable for living creatures. What is not known is that the Sahara Desert was actually formed later, it is said that it is 50 stories deep, if one day the sand is dug up, then what is under it, let us ** after all.

The Sahara Desert is one of the most inhospitable places on earth, in fact, the Sahara Desert is not all sand, there are many rocks, there is a mountain more than 3,000 meters above sea level, salt marshes and oases. Over the years, science and technology have become more and more advanced, and scientists have also used some methods to test the depth of the Sahara Desert, and the results obtained are that the deepest part of the Sahara Desert is 320 meters. And its average depth is about 150 meters, in fact, most people don't know what these heights mean, for example, in our life a floor is about three meters, then its deepest place, is actually 107 stories as high, and the Eiffel Tower in Paris, France.

Everyone is speculating that if the sand is dug up, then there is something at the bottom of the Sahara Desert, in fact, we can't dig up so much sand, but according to relevant research, we can speculate, some studies have shown that there was a huge lake at the bottom of the Sahara Desert, so this may also indicate that there is a water source under the Sahara Desert. And after further research, it was found that these water sources can be used directly, which really surprised ordinary people. There are also studies that have found that there are still mineral resources and oil fields under the desert that can be developed, but it should be very difficult to develop minerals in the Sahara Desert.

In addition, it was discovered that the Sahara Desert was once a grassland, and in this grassland, life could be nurtured, and it was a treasure place. But these also happened 2.5 million years ago, after which there were no signs of life here, and the climate was relatively pleasant at that time and there were no deserts. About 10,000 years ago, there were many imprints left by humans in this area, which can be attested to by murals.

Either way, the wonders of the Sahara are nature's gift to humanity.

Its depth is 180 meters, and of course depending on the area on the surface of the desert, the depth of the desert can reach 180 meters.

It may be more than 2,000 meters, so it is very deep. It makes people feel terrible that they don't know how deep it is.

The depth of each area of the Sahara Desert is different, and on average, it can reach a depth of about 180 meters.

1. The Sahara Desert is the second largest desert in the world after Antarctica, with an area of about 9.06 million square kilometers, making it the world's largest sandy desert. The Arabic word Sahara means "great desert". It is located south of the Atlas Mountains and the Mediterranean Sea, about north of the 14° north latitude, from the Atlantic coast in the west to the shores of the Red Sea in the east.

It runs through the northern part of the African continent, with a length of 5,600 kilometers from east to west and a width of about 1,600 kilometers from north to south.

2. There are various types of arid landforms in the Sahara Desert. It consists of stony deserts, gravel deserts, and deserts. The rocky deserts are mostly found in the central and eastern Sahara in the higher terrain, and the Nubian desert east of the Nile is also mainly rocky deserts.

Gravel deserts are mostly found between rocky deserts and deserts, mainly distributed in the stony areas of the Libyan Desert, the Atlas Mountains, the Kusi Mountains and other piedmont alluvial fan areas.

3. The area of the desert is relatively broad, except for a few higher mountains and plateaus, there are large areas everywhere. The famous ones are the Libyan Desert, the Raibyanai Desert, the Al Obari Desert, the Eastern Desert and the Western Great Desert of Algeria, the Shesh Desert, the Juf Desert, the Avana Desert, the Birma Desert, etc.

4. The Sahara region is vast and sparsely populated, with an average of less than 1 person per square kilometer. Predominantly Arabs, followed by Berbers, etc. Population and agricultural production are mainly distributed in the Nile valley and oases, and some are mainly nomadic.

Causes of the Sahara Desert:

1. North Africa is located on both sides of the Tropic of Capricorn, which is controlled by the subtropical high pressure zone all year round, and the dry and hot downdraft prevails, and the African continent is narrow in the south and wide in the north, and the range controlled by the subtropical high pressure belt is large, and the dry heat area is wide.

2. North Africa is close to the Asian continent, and the northeast trade winds blow from the eastern Luling Tongzao area, which is not easy to form precipitation, making North Africa drier.

3. The coastline of North Africa is straight, and there is the Ethiopian plateau on the east side, which plays a blocking role in the humid air flow, so that the vast inland areas cannot be affected by the ocean.

4. The Canary cold current passes through the west coast of North Africa, which has a cooling and dehumidifying effect on the western coastal areas and makes the desert approach the west coast.

5. The terrain of North Africa is single, the terrain is flat, the ups and downs are not large, and the climate is single, forming a large area of desert areas.

The largest desert in the world is actually the Taklamakan Desert, which is currently in the Congo Basin of Africa and more than twice the size of the Sahara Desert.

Taklamakan Desert is a desert located in Xinjiang, China, with an area of 330,000 square kilometers.

The Sahara region experienced a dramatic climate change about 4,000 years ago, and the climate there changed dramatically over the next 300 years.

10,000 years ago, the Sahara, now the world's largest desert, was filled with weeds and scrubland. But then, the summer temperature rose and there was almost no rainfall. This climate change has wiped out many paleontologies and forced those that survived to migrate to other regions.

Another, less dramatic climate change in the Sahara occurred between 6,700 and 5,000 years ago, the researchers said.

According to these scientists at the Potsdam Meteorological Institute, desertification in the Sahara is one of the most dramatic climate changes in 10,000 years. This meteorological model suggests that human land use was not a significant factor in the formation of the Sahara Desert.

Deserts are formed by a chronic lack of water in a piece of land. The causes of water scarcity are complex!

The first is perennially controlled by the subtropical high with scarce precipitation, such as the Kalahadi Desert in southern Africa.

The second is that it is deep inland, and it is difficult for water vapor from the ocean to enter. For example, the Taklamakan Desert.

The third is that due to the air pressure distribution, the warm and humid air flow cannot be affected. There is only one example of this, the Thar Desert on the southern border between India and Pakistan

The fourth is perennially affected by dry trade winds. There are two sub-causes, one of which is that the trade winds come from inland and lack water vapor (e.g. in the Arabian desert). The second is that the trade winds come from the ocean, but after crossing the high mountains, they come down the leeward slopes (e.g. the Great Sandy Desert in Australia).

The fifth is the desert caused by the cooling of cold snaps. For example, the desert off the coast of Somalia.

The Sahara Desert is the first.

I. III.

Fourth, the fifth result of the combined effect of several factors.

Many deserts are also the result of a combination of factors.

How deserts are formed: natural causes, man-made causes (mainly):

The causes of the desert.

Desertification can be understood as a kind of desertification, that is, after the destruction of vegetation, the ground loses its cover, and under the action of arid climate and strong winds, the green field gradually turns into a desert-like landscape. Land desertification occurs mainly in arid and semi-arid areas.

The key factor in the formation of the desert is the climate, but in the edge of the desert, the native vegetation may be grassland, which is desertified due to human reasons, and these human factors are mainly as follows.

l) Unreasonable farming. Whether in desert areas or native grassland areas, once reclaimed, the land will be desertified. From 1958 to 1962, a one-sided understanding of large-scale agriculture was carried out, and in pastoral areas, semi-agricultural and pastoral areas, and agricultural areas were indiscriminately cultivated, and in 1966 and 1973, a one-sided emphasis was placed on grain as the key link, saying that "herdsmen do not suffer from the loss of grain." As a result, the phenomenon of indiscriminate reclamation of pastures appeared in pastoral areas, resulting in the rapid development of desertification of pastures.

Due to the serious wind erosion, after the reclamation of the desert area, the yield can still maintain twenty or thirty kilograms in the first two years, and it is difficult to recover even the seeds later, so it is only to abandon the cultivation and open up a new piece of land, which leads to "one acre of wasteland and three acres of desertification". According to statistics, 1.2 million hectares of grassland have been reclaimed in Ordos alone, resulting in 1.2 million hectares of grassland desertification to varying degrees.

2) Overgrazing. Due to the overabundance of livestock, the grassland grass production is insufficient, so that many high-quality grass seeds can not grow or the seeds are ripe and eaten. In addition, like goats, which account for more than half of the total number of livestock, they are very fast, good at stripping the stems and bark of sandy shrubs, gouging grass roots, and trampling, so that the grassland produces less and less grass, forming desertified land, causing a vicious circle.

3) Unreasonable woodpicking. Historically, wood mining has been one of the important factors responsible for the formation of quicksand in irrigated oases and dryland agricultural areas in China. For example, it is estimated that a family of five needs more than 700 kilograms of firewood per year, and each household needs 5,000 kilograms if Artemisia is extracted, which is equivalent to most or all of the Artemisia oleifera produced by more than 3 hectares of fixed and semi-fixed sand dunes.

According to statistics, 200,000 hectares of Bala grassland has been desertified by Yikezhao League alone.

Normal deserts are located due to excessive sunlight, resulting in drought and widespread desertification.

Thus creating a desert.

And we have only exacerbated this process of desertification.

The rocks are slowly formed by years of sun, rain and wind.