Five p.m.

At this time, it was the hottest time of the day, and Bi Fang and his camel hid under a rock wall to cool off.

"The best time of the day is between 4 a.m. and 11 a.m., and then 4 to 7 p.m., and it's okay to travel overnight, but as I said, it's the peak of animal activity, so it's more dangerous, and it's easier to be mentally stressed in a dark environment."

"And people always have to rest, we are not camels, it is impossible not to eat and drink for days, the nights in the Sahara are very cold, in the cold environment, sleep as much as possible, the calories you lose due to excessive activity will not be recycled."

"Don't worry you'll sleep until you're exhausted, you'll wake up frozen before you freeze."

Bi Fang took a sip of saliva, his forearms naturally drooped, resting on his knees, squinting at the scorching sun beyond the shadows, with heat waves and deserts everywhere.

If you go out on a trip, follow a large team and a camel team, it is naturally an incomparably magnificent natural scenery, broaden your horizons and body and mind, but if you are alone, your heart is probably full of despair, right?

Bi Fang twisted the kettle and pointed to the vast desert in front of him: "Can you imagine that the Sahara, which is now full of sand dunes, used to be a dense forest."

[As you can imagine, I thought] [Give me some face, Fang Shen doesn't want to see your reaction] [Pasta should be mixed with 42 concrete]

[Although I can't believe it, I'm not stupid, when the old man said this, I knew that it was also true in outrageous (dog head)]

[Reason tells me to accept it]

The barrage is always strange, and Bi Fang, who has long been accustomed to this, did not interrupt his narration.

"Hundreds of millions of tons of dust are carried away every year in the Sahara by the northeast trade winds, most of which are deposited in the Atlantic,"

"Through the study of ancient sediments, scientists have found that the climate of the Sahara has been switching regularly between dry and wet for the past hundreds of thousands of years, with a time cycle of more than 20,000 years."

"On the other hand, this phenomenon is confirmed by the ancient murals found in the Sahara Desert, in which many animals such as horses, buffaloes, elephants, giraffes and other animals appear, and we all know that it is impossible for these animals to survive in the desert, especially horses."

"About 40,000 to 20,000 years ago, the Sahara was a humid climate with lush vegetation, rivers, lakes and frequent floods."

"Between 20,000 and 10,000 years ago, the climate became dry, plants became scarce, and rivers cut off to become wadi valleys."

"After this dry period, the climate becomes humid again. By about 3500 B.C., the rainfall was abundant, the vegetation was luxuriant, the lakes and rivers were full, and the water area reached its maximum."

"But since then, the gale has returned to the land, and the lush forests have become grasslands, becoming a paradise for cattle, sheep, antelopes, giraffes, hippos, buffalo and other animals have disappeared, and fishing has ceased to exist."

"After 2000 B.C., the climate became drier, grassland animals also withdrew from the stage, rivers were cut off, lakes became smaller, dried up or disappeared, vegetation withered and degraded, and the grassland completely turned into a desert, and many grassland animals were forced to withdraw from the historical stage of the Sahara."

"Up to now, the Sahara has become the world's largest and most typical dry tropical region."

[Why is this happening, is it purely due to the climate, or what?] [Environmental damage?] [Not necessarily, the Sahara seems like this a long time ago]

"It's not environmental damage, it's the climate, and if there's a root cause, it's the shrinkage of the Tethys Sea."

[What's that] [Something I haven't heard of again] [Is there such a sea on Earth?]

"There used to be." Bi Fang grabbed a handful of sand and slowly slipped it down.

"Due to the movement of the Earth's tectonic plates, the land on Earth has been moving slowly, and 40 million years ago, the tectonic plate where Africa is located was not where we see it now, and there was a wide ocean to the north of it, which was the Tethys Sea."

"However, from 40 million years ago, the plate in Africa began to move northward, and over time, it eventually collided with the plate in Europe, which caused the closure of the Tethys Sea, and the northern part of the African plate was also lifted by squeezing, and more land was exposed."

"The contraction of the Tethys Sea not only led to changes in the mean climate regime in North Africa, but also strengthened the response of the African summer monsoon to orbital changes, which subsequently became a major factor in the change of the extent of the Sahara Desert."

"If the contraction of the Tethys Sea is the root cause, then the precession of the earth is the direct cause of the regular switching of the climate in the Sahara."

"The precession of the earth means that the axis of rotation of the earth will rotate around the earth's axis of rotation under the gravitational influence of the sun and the moon, and the trajectory of this rotation in space is a cone, and its period is about 25,700 years."

"We know that the highest amount of solar energy is obtained in direct sunlight on the earth, and as the slope of sunlight increases, the amount of solar energy obtained decreases."

"The precession of the earth changes the inclination of sunlight on the earth during the same season, thus affecting the distribution of solar energy between the seasons of the earth."

"In other words, the precession of the earth will cause a regular fluctuation of sunlight energy in the same area of the earth in the same season, and in the case of the Sahara, this will directly affect the strength of the summer monsoon."

"In fact, it is the sea breeze and the land breeze, and if the summer monsoon is not enough, the sea breeze will be weak, and there will not be enough moist air from the ocean to enter the land, and slowly, it will be dry."

"This guy, how do you know so much?"

"We need to build shelter, and by tomorrow we need to find some food."

"Moistened by a large amount of moist air from the ocean, there was no Sahara Desert in northern Africa at that time, but a large oasis. [Strange things fly into the Celestial Spirit] [I seem to have glimpsed the truth of the world] [Oops, the brain is about to grow] [Hell, I've never learned any of these things......] [Be confident, high school geography doesn't teach this] [If I'm still a high school student, this topic, I'm sorry, I can't say two words about this topic even if I'm a high school student.] The audience fell into dementia. This starts with continental drift and continues to climate change, which is not necessarily clear without professional research. Egyptian camel team, Mugallen riding on a camel looking at his phone with a constipated face. Is this something that people should know? Bi Fang rummaged through his backpack and counted the supplies. The water resources are still sufficient, and the camels also have a few desert gourds hanging on their bodies to replenish them, which can last for at least five days, but the food is already a little insufficient, and there are a few small pieces of dried fish. The previous food was basically left over from catching some fish in the second half of the crossing Nemo Point, and after a few days, I ate almost enough. Looking up, the original Gobi has completely turned into a vast desert. Turned out a piece of dried fish, stuffed it into his mouth and chewed dryly, watching the sun gradually slanting westward.

Source:; order=817&bookid=60ec10066adbbbf8dfc332e5&booksourceid=0&bookname=Wild Adventure Live&host=%3a%2f%; chapterlink=yuewen%3a%2f%%2fchapter%2f63482ca8458b3c5783927456%3fcv%3d1665680357698%26cbid%3d20083343108547404%%3d65934642372471116%26chargetype%3d2%26order%3d817% 26merchant%3dyuewen?vipPrevious Chapter 805 Dream