Chapter 806 From 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 most suitable time of day to travel is from 4:00 am to 11:00 am, and then from 4:00 am to 7:00 pm in the afternoon. It is also possible to travel overnight, but as I said, it is the peak period of animal activity, so the danger 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 night in the Sahara is very cold, 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, placed on his knees, and squinted 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 is naturally an incomparably splendid natural scenery, broadening your horizons and 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.”

[As you can imagine, I thought of it] [Give some face, Fang Shen 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)]

[sanity 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,”

“By studying ancient sediments, scientists have found that the Sahara’s climate has been regularly switching between dry and wet over the past few hundred thousand years, with a time period of more than 20,000 years.”

“And the ancient murals found in the Sahara Desert also confirmed this phenomenon on the other hand. Many animals such as horses, buffalo, elephants, giraffes appeared in these murals, and we all know that these animals are impossible Those who live in the desert, especially horses.”

“From about 40,000 to 20,000 years ago, the Sahara was still in a humid climate, with lush vegetation, rivers, lakes, and frequent flooding.”

“And in the period from 20,000 to 10,000 years ago, the climate became dry, the vegetation 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, abundant lakes and rivers, and the largest water area.”

“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, 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, and many grassland animals were forced to withdraw from the Sahara. historical stage.”

“Until now, the Sahara has completely become the largestmost typical tropical dry area in the world.”

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

“It’s not the destruction of the environment, it’s the climate, and if the root cause is the shrinkage of the Tethys.”

[What, what, what] [something I haven’t heard of before] [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 plates, the land on the earth has been moving slowly all the time. 40 million years ago, the plate where Africa was located was not in the position we see now, and there was a wide ocean in the north of it. It’s the Tethys Sea.”

“However, from 40 million years ago, the plate on which Africa is located began to move northward continuously, and over time, it finally hit the plate on which Europe was located, which caused the closure of the Tethys Sea, and the African The northern part of the plate where it is located has also been lifted due to compression, and more land has emerged from the sea.”

“Contraction 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, and subsequently became the main factor controlling the changes in the range of the Sahara Desert.”

“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. ”

“We know that where the sun shines directly on the earth, the solar energy is highest, and as the **** of the sun increases, the solar energy received decreases.”

“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 a regular fluctuation of sunlight energy from less to more, and from more to less” in the same area of ​​the earth 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 also the sea breeze and the land breeze. If the summer monsoon is not enough, the sea breeze will be weak, and there will not be enough moist ocean air to enter the land. Slowly, it will become dry.”

“How does this guy know so much?”

“Shelter needs to be built, and by tomorrow we need to go find some food.”

“With a lot of moist air from the ocean, there was no Sahara desert in northern Africa at that time, but a large oasis. [Tianling Geli flew into strange things] [I seem to see the truth of the world] [Oops , my brain is about to grow] [special, I have never learned these things…] [be confident, high school geography does not teach this] [if I was still a high school student, this topic, sorry, this Even if I am a high school student, I can’t say a word.] The audience fell into dementia. This starts from continental drift, all the way to climate change, it is not necessarily clear without professional research. Egyptian camel team, Mugallon rides on The camel looked at the phone with a look of constipation. This is something people should know? Bi Fang turned over his backpack and counted the supplies. I persisted for five days, but the food was not enough, and there were still a few small pieces of dried fish. The previous food was basically left over after catching some fish in the second half of crossing Nemo Point. I almost finished eating. I looked up and looked around, the original Gobi had completely turned into a vast desert. I pulled out a piece of dried fish, and Bi Fang stuffed it into his mouth and chewed it dry, looking at the gradually slanting sun.

Source: ;order=817&bookid=60ec10066adbbbf8dfc332e5&booksourceid=0&bookname=Live Wild Adventures&host=https%;chapterlink=yuewenhttp%chapter637482ca8458b3c5783927456cv69927456cv6965556cv6699d16% 26cbid20083343108547404934642372471116chargetype2order817merchantyuewen?vipPrevious Chapter805Dream