Live Wild Adventure

Chapter 810 begins with continental drift.
Five p.m.

At this time, it was the highest temperature of the day, and Bi Fang and the camel hid under a rock wall to enjoy the shade.

"The best time of day to travel is from [-]:[-] to [-]:[-] in the morning, and then from [-]:[-] to [-]:[-] in the afternoon. It is also possible to travel overnight, but as I said, it is the peak period of animal activity, so the risk is relatively high. , and in a dark environment, it is easier for people to bear greater mental pressure."

"And people always have to rest, we are not camels, it is impossible to eat and drink for several days, the Sahara is very cold at night, in a cold environment, sleep as much as possible, the heat you lose from overactivity will not circulate Regenerate."

"Don't worry you'll fall asleep in your sleep, unless you're exhausted, you'll be frozen before you freeze."

Bi Fang sipped his saliva, his forearms drooped naturally and placed on his knees, squinting at the blazing sun outside the shadows, with heat waves and deserts everywhere.

If you go out on a trip and follow a large team and a camel team, it will naturally be an incomparably splendid natural scenery, broaden your horizons and your body and mind, but if you are alone, I am afraid that your heart is full of despair, right?

Bi Fang screwed on the kettle and pointed to the vast desert in front of him: "Can you imagine that the Sahara, which is now full of dunes, was actually a dense forest before."

[I can imagine, I thought of it]

【Save face, God Fang doesn't want to see your reaction】

[Spaghetti should be mixed with No. 42 concrete]

[Although I can't believe it, I'm not an idiot. When Lao Fang said this, I knew that it was true even when it was outrageous (dog head)]

【Intelligence tells me to accept it】

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

"Hundreds of millions of tons of dust are carried away from the Sahara every year by the northeast trade winds, and most of it is deposited in the Atlantic Ocean," he said.

"Through the study of ancient sediments, scientists have found that in the past few hundred thousand years, the Sahara's climate has been regularly switching between dry and wet, with a time period of more than 10 years."

"And the ancient murals found in the Sahara Desert also confirmed this phenomenon from the other side. There are many animals such as horses, buffaloes, elephants, giraffes, etc. in these murals, and we all know that these animals are impossible. Those who live in the desert, especially horses."

"About 4 to 2 years ago, the Sahara region was still in a humid climate period. At that time, plants were lush, rivers were criss-crossing, lakes were clustered, and floods were frequent."

"And in the period from 2 to 1 years ago, the climate here became dry, the plants became scarce, and the rivers were cut off and became dry valleys."

"After this dry period, the climate became humid again. Around 3500 BC, there was abundant rainfall, lush vegetation, lakes and rivers filled, and the water area reached its maximum."

"But since then, strong winds have returned to this land, and the lush forests have turned into grasslands, becoming a paradise for cattle, sheep, antelopes, and giraffes.

"After 2000 BC, the dryness of the climate intensified, and grassland animals also withdrew from the stage, rivers stopped flowing, lakes became smaller, dried up or disappeared, vegetation withered and degraded, and the grasslands were completely turned into deserts. Many grassland animals were forced to withdraw from the Sahara. historical stage."

"Until now, the Sahara has completely become the largest and most typical tropical dry region in the world."

[Why did it become like this, is it simply due to the weather, or what? 】

【Environmental damage? 】

[Not necessarily, the Sahara seems to have been like this a long time ago]

"It's not environmental damage, it's the climate, and the root cause is the shrinking of the Tethys Sea."

【What, what?】

[something I haven't heard of yet]

【Is there such a sea on earth? 】

"Used to have."

Bi Fang grabbed a handful of sand and slowly slipped it down.

"Due to the movement of the earth's plates, the land on the earth has been moving slowly all the time. 4000 million years ago, the plate where Africa was located was not in the position we see now. There was a wide ocean to the north of it. It's the Tethys Sea."

"Under the nourishment of a large amount of humid air from the ocean, there was no Sahara desert in northern Africa at that time, but a large oasis.

"However, from 4000 million years ago, the plate on which Africa is located began to move northward continuously, and over time, it finally hit the plate where Europe was located, which caused the closure of the Tethys Sea, and the African The northern part of the plate is also uplifted by the compression, and more land is exposed to the sea."

"The shrinking of the Tethys Sea not only led to changes in the mean climatic state in North Africa, but also enhanced the response of the African summer monsoon to orbital changes, which subsequently became the main factor controlling changes in the extent of the Sahara Desert."

[Tianling Gerry flew into a strange thing]

【I seem to see the truth of the world】

[Oops, my brain is about to grow]

"If the contraction of the Tethys Sea is the root cause, then the Earth's precession is the direct cause of the regular switching of the Sahara's climate."

"The so-called precession of the earth means that the rotation axis of the earth will rotate around the orbital axis of the earth under the influence of the gravitational force of the sun and the moon. The trajectory of this rotation in space is a conical surface with a period of about 2.57 years. "

"We know that where the sun shines directly on Earth, the solar gain is highest, and the solar gain decreases as the sun's slope increases."

"Earth precession changes the inclination of sunlight on Earth during the same season, thereby affecting the distribution of solar energy between Earth's seasons."

"That is to say, the precession of the earth will cause the same area on the earth to have a regular fluctuation of 'from less to more, and from more to less' of sunlight energy in the same season, and for the area where the Sahara is located. In other words, this will directly affect the strength of the summer monsoon."

"In fact, it is sea breeze and land breeze. If the summer monsoon is not enough, the sea breeze will be weak, and there will not be enough humid air from the ocean to enter the land. Slowly, it will become dry."

"Perhaps thousands of years later, this place will turn into a wet forest again and become a paradise for animals."

[Excuse me, I have never learned these things.]

[Be confident, high school geography does not teach this]

[If I'm still a high school student, I'm sorry about this topic, even if I'm a high school student, I can't say a few words. 】

[No, what sea contracted 4000 million years ago, why did it become a desert 4 years ago? 】

"Because the contraction is only the beginning, the continental movement is a slow process. It was not until the Toltonian stage of the late Miocene, about 700 million to 1100 million years ago, that the sea shrank almost, and the source of water vapor was completely cut off."

"The reason why the cycle only started 4 years ago is related to the meteorological history of the earth. In fact, what you see more now is that the annual summer monsoon or any prevailing wind belt was formed in the past tens of thousands of years."

"4 years ago, the earth was still in the ice age, and it had lasted for millions of years before, and there was no so-called summer monsoon at all."

The audience fell into dementia.

This starts from continental drift, to climate change, and then to the history of the earth. It is not necessarily clear without professional research.

"How does this guy know so much?"

The Egyptian camel team, Mugalun was riding on a camel and looked at his mobile phone with constipation on his face.

Is this something people should know?
Bi Fang flipped through his backpack and counted the supplies.

The water resources are still very sufficient. There are also several desert gourds hanging on the camel to supplement it. It can last for at least five days, but the food is not enough, and there are a few small pieces of dried fish.

The previous food was basically what was left after catching some fish in the second half of crossing Nemo Point. After a few days, it was almost eaten.

Looking up and looking around, the original Gobi has completely turned into a vast desert.

Pulling out a piece of dried fish, Bi Fang stuffed it into his mouth and chewed it dry, watching the sun gradually slanting westward.

"Shelter needs to be set up, and by tomorrow we need to go find some food."

(End of this chapter)