At this time, the temperature was the highest of the day, so Bi Fang and the camel hid under a rock wall to enjoy the cool air.
"The best time of the day to drive is from 4 to 11 in the morning, and then from 4 to 7 in the afternoon. You can also drive overnight, but as I said, that 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 need to rest. We are not camels. We cannot go without eating or drinking for several days. It is very cold at night in the Sahara. In a cold environment, sleep as much as possible. The heat you lose due to excessive activity will not circulate.
Regenerate."
"Don't worry about being stuck in your sleep. Unless you're exhausted, you'll wake up before freezing to death."
Bi Fang sipped his saliva, and his forearms naturally drooped, placed on his knees, and he squinted at the blazing sun outside the shadows. There were heat waves and deserts everywhere.
If you are traveling, following a large team and camel team, you will naturally enjoy the incomparable majestic natural scenery, which will broaden your horizons and broaden your mind and body. But if you are alone, your heart may be filled with despair, right?
Bi Fang put on the kettle and pointed at the vast desert in front of him: "Can you imagine that the Sahara, which is now full of sand dunes, was actually a dense forest before."
[As you can imagine, I thought of it] [Give me 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 if it was outrageous (dog head)]
[Reason tells me to accept it]
The barrage was always strange, and Bi Fang, who had long been accustomed to it, did not interrupt his narration.
"Billions 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,"
"Through the study of ancient sediments, scientists have discovered that over the past hundreds of thousands of years, the climate of the Sahara has been regularly switching between dry and wet, with a time period of more than 20,000 years."
"The ancient murals discovered in the Sahara Desert also confirm this phenomenon on the other hand. In these murals, many horses, buffaloes, elephants, giraffes and other animals appear, and we all know that these animals are impossible.
Those who survive in the desert, especially horses."
"About 40,000 to 20,000 years ago, the Sahara region was still a humid climate period, with lush vegetation, crisscrossing rivers, clusters of lakes, and frequent floods."
"In the period from 20,000 to 10,000 years ago, the climate here became dry, the plants became scarce, and the rivers dried up and became dry valleys."
"After this dry period, the climate became humid again. By around 3500 BC, rainfall was abundant, vegetation was luxuriant, lakes and rivers were full, 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. Hippos, buffaloes and other animals have disappeared, and fishing and fisheries have ceased to exist."
"After 2000 BC, the climate became drier and grassland animals also withdrew from the stage. Rivers dried up, lakes became smaller, dried up or disappeared. Vegetation withered and degraded. Grassland completely turned into desert. Many grassland animals were forced to withdraw from the Sahara.
The stage of history.”
"Until now, the Sahara has completely become the largest and most typical tropical dry region in the world."
[Why is it like this? Is it simply due to climate, 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. If we want to talk about the root cause, it should be the contraction of the Tethys Sea."
[What, what, what, what?][It’s something I’ve never heard of again][Is there such a sea on earth?]
"There used to be." Bi Fang grabbed a handful of sand and slowly slid it down.
"Due to the movement of the earth's plates, the land on the earth has actually been moving slowly. 40 million years ago, the plate where Africa is located was not located where we see it now. There was a wide ocean to the north. It’s the Tethys Sea.”
"However, starting from 40 million years ago, the plate on which Africa is located began to move northward. As time went by, it finally collided with the plate on which Europe was located. This caused the closure of the Tethys Sea, and Africa The northern part of the plate where it is located has also been lifted due to compression, and more land has been exposed to the sea."
"The contraction of the Tethys Sea not only led to changes in the average climate state of North Africa, but also strengthened the response of the African summer monsoon to orbital changes, and subsequently became the main factor controlling changes in the scope of the Sahara Desert."
"If the contraction of the Tethys Sea is the fundamental cause, then the precession of the earth is the direct cause of the regular switching of the climate of the Sahara."
"The so-called precession of the Earth means that the Earth's rotation axis will rotate around the Earth's revolution axis under the influence of the gravitational pull of the sun and the moon. The trajectory of this rotation in space is a cone, with a period of approximately 25,700 years. "
"We know that the solar energy received is the highest at locations on Earth where the sun shines directly, and as the inclination of the sunlight increases, the solar energy received decreases."
"The precession of the Earth will change the inclination of sunlight in the same season on the Earth, thus affecting the distribution of solar energy between seasons on the Earth."
"That is to say, the precession of the earth will cause the sunlight energy in the same area on the earth to fluctuate regularly in the same season, from less to more, and from more to less. However, for the area where the Sahara is located, It is said that this will directly affect the strength of the summer monsoon."
"In fact, it means sea breeze and 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. Gradually, drought will occur."
"How does this guy know so much?"
"We need to build a shelter. We need to look for some food until tomorrow."
"Moisturized 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. [Tian Linggeli flew into a strange thing] [I seem to have glimpsed the truth of the world] [Oops , my brain is about to grow] [Damn, I have never learned these things...] [Be confident, high school geography does not teach this] [If I were still a high school student, this topic, sorry, this Even if I am a high school student, I can’t say a few words about the topic.] The audience fell into dementia. Starting from continental drift and continuing to climate change, those who have not done professional research may not necessarily know clearly. The Egyptian camel team, Mu Gallen rode in Looking at his cell phone on the camel, he looked constipated. Is this something that people should know? Bi Fang rummaged through his backpack and took stock of the supplies. There was still plenty of water, and there were a few desert gourds hanging on the camel to supplement it. At least it could 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 the leftovers after catching some fish in the second half of the crossing to Point Nemo. After these few days, there was no more food. It was almost done. He looked up and looked around. The original Gobi Desert had completely turned into a vast desert. He dug out a piece of dried fish, put it in his mouth and chewed it while looking at the sun that was gradually setting in the west.