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In 1935, in Kansas, when the sandstorms that had been raging for weeks stopped, people rejoiced and walked out to celebrate.

An hour later, the largest sandstorm ever recorded in the history of civilization struck six western U.S. states, with 390,000 square kilometers of moving earth walls three times the size of the island of Intland wreaking havoc and enveloped in natural carnage.

This storm, named the Grey Bowl, looks from outer space, if the Americas are a table, then this sandstorm is like a gray iron bowl upside down on the North American continent. The ash bowl ravaged 80 percent of U.S. land territory in three weeks, reaching 900 kilometers off the coast of the Atlantic.

This day is called, Black Sunday.

The term was later given a variety of meanings, but once it appeared in the literature, it had only one meaning, specifically referring to sandstorms.

November 7, 2010, was another Black Sunday.

This time, the sandstorm was only one in three hundredth of the size of the ash bowl, and it almost caused Fang Hong to die in an uninhabited cave.

The main force of the sandstorm flew by, and Fang Hong lifted the heavy sand, revealing his head, and breathed heavily.

In sandstorms, humans can die from any cause, and the biggest chance of death is to be buried alive by the sand and die of suffocation.

Fang Hong showed his head, took a deep breath, wiped the sand off his face, and took a sip of water.

"Brother Gun is out!"

"Brother Gun, we thought you were buried!"

Fang Hong let out a big sigh: "I was already buried, and I got out again." ”

"It's still a sandstorm outside, and now going out is looking for death, and after dark, there's no way to get out, and tonight, I can only squat here." ”

"People's eyelashes and nose hair are all for sand prevention, and I am glad that the hormones are bursting and there is a lot of hair. ”

"Phew. It's not that the water friend complained, but Fang Hong spit out a mouthful of mud.

His mouth was full of sand, and after taking a sip of water, he couldn't swallow it, so he simply spit it out.

"Now, I can't do anything, I'm going to sleep, see you tomorrow. ”

"Brother Gun, are you sure you want to turn off the live broadcast?"

In fact, in this case, the most terrible thing is not the weather, but loneliness.

Break into the wild world and die without friends.

Fang Hong waved his hand: "If there is a situation, I will start the live broadcast as soon as possible, everyone bye." ”

At noon in China time, at two o'clock in the morning in western North America, the live broadcast opened again.

In the darkness, a light shot out, and Fang Hong looked around: "It's a big trouble." ”

Stream.

A huge current of water came from above the crack.

The huge sound of water, the sailors can hear it clearly: "What's the situation?"

"This fissure is another tributary of the Red River system, and I don't know from which direction the rain will come from the direction of this fissure, and it will eventually flow into the Red River, and I am in big trouble. ”

In order to avoid the sandstorm, Fang Hong walked down along the ground fissure, this kind of water flow is very rapid in the upstream, but there is not much water, and when it reaches the downstream, it slows down, but the amount of water is sufficient.

In other words, it's almost flooded.

On a knee-high layer of sand, the water overflowed.

The water washes the sand and the water becomes muddy, and on the other hand, when the water passes through, the sand layer here will become silt-like things, how to walk?

What's more, the temperature is so low at night, if you soak in water, the heat will pass quickly, and you will freeze.

Fang Hong put the three stones together as fast as he could, then put away the rope and sat on the stones, watching the sand flow turn into a stream of water, and watching the water level become high.

The most unfortunate thing is that in front of the ground crack I don't know where it is, there should be a place blocked by stones, and after the water flows, it begins to rise, and even the water level of this cave has been rising again.

There's a natural dam ahead!

"Brother Gun, you are here in the Great Desert Gobi, how can there be so much water? I was also attacked by the current last night, and I came again tonight?"

Fang Hong was helpless: "How do you think the red conglomerate sedimentary rock here is formed? Under the weathering, a large amount of sand and gravel is formed, which is carried by the water flow, superimposed layer by layer, squeezed, and finally turned into sedimentary rock. ”

"We are just one small tip of the iceberg of the countless topographical changes that have taken place in the 3.2 billion years of the Great Rift Valley. ”

The Great Rift Valley is a favorite place for geological scientists to conduct scientific research because of the special topography, most of the rocks here are sedimentary rocks, which means that they were formed in the endless years after the earth had water, and the igneous rocks on this non-volcanic landform can be traced back directly to the formation of the earth.

However, as an adventurer in the middle of it, you will not like the formation of igneous rocks or the formation of aqueous rocks (sedimentary rocks).

Faced with the rising water level, Fang Hong could only get up and squat on the stone.

"The water level is almost a meter, and if there is a boulder blocking the waterway in front of the unfortunate one, maybe the water will rise to the top of the cave. ”

"Now I am in a dilemma, whether I go out and climb up, or wait in the cave, there is a feeling of waiting for death. ”

The water flow quickly rose to the height of the stones, Fang Hong could only stand up, as for the mountaineering bag, Fang Hong, who had not eaten at night, could only give up it, anyway, the water flow was only raised, and it was not a torrent, so it could not be washed away.

Looking at the raised water level, Fang Hong took a deep breath: "If the water level continues to rise, I will choose to climb out of the cave wall to escape, the water level will overflow my calves, I will have to make a choice." ”

What is gratifying is that after the water level rises to Fang Hong's ankle, the lifting speed slows down.

Fang Hong exhaled: "It seems that the height of the natural dam in front is only so high, and the water level continues to rise because the rapids coming from the rear slow down when passing through this area, causing the water level to rise, and you can see me standing in a military posture again." ”

Speaking of standing in a military posture, the aircraft immediately came to a military song.

Fang Hong was powerless to complain and endured silently.

Fang Hong's frost resistance is indeed very strong, but frost resistance and preserving heat without losing heat are two different things.

If Fang Hong had enough physical strength now, he could still move to warm up his body, but he hadn't eaten at night, and he really didn't have the strength to move at this time.

"Nature is really strange, the sandstorm during the day, which is a symbol of drought, and the flood at night, which is why the Great Rift Valley area has no permanent residents. ”

"Brother Gun, it's safe now, as long as it's not life-threatening. ”

Fang Hong looked at the water: "If the water level does not recede, how should I get out tomorrow? Climb up from the cliff wall, or step into the water and struggle with the mud?"

"When the water level receded, there was no water when we came in here, indicating that the boulder did not completely block the way. ”

"Not necessarily, if the sandstorm just plugs the gaps, the water level will not drop for a short time. ”

After more than an hour, the water level actually dropped, and above the sand layer, there were only a few centimeters of water, Fang Hong sat on the stone pier: "I'm going to sleep, and when it dawns, I'll find a way to leave." ”

When preventing and controlling desertification, everyone will complain about soil erosion and the moisture content of sand, but when you encounter silt tidal flats, you will complain that the water content of sand is actually very strong.

The water rises and falls, the oblique moon hangs westward, the morning light spreads out, and the earth recovers.

The live stream is on again.

"Brother Gun, there's no water, only sand!"

"Brother Gun, go out. ”

"Go out?" Fang Hong pointed to the sand, and every step he took was like pulling a carrot.

A sailor saw a piece of uneven sand under the stone: "Brother gun, what is this piece?"

Fang Hong shrugged: "I don't think you want to know what's down there." ”