In the afterglow of the setting sun, there are small sand dunes that stretch endlessly, as far as the eye can see. Each small sand dune www.biquge.info surrounded by black stones, and between the small sand dunes is a radial line composed of black stones, shining with black light under the sunset, like thousands of black suns placed in the desert, the scene is spectacular beyond words.

I, Xiaopang, Zhang Meng and Lao Zhang were stunned for a long time, but Xiaopang came back to his senses first, and said with a long sigh: "Damn, the fat man also claims to have experienced a lot and seen a lot, but this formation is the first time in his life to see it, how do you say that word? By the way, 'breathtaking'! It's just fucking 'breathtaking'!"

Lao Zhang nodded, and also said: "Yes, it is so spectacular, it is not an exaggeration to describe it as 'breathtaking', I think it far surpasses the Terracotta Warriors and Horses of Qin Shi Huang, the eighth wonder of the world, in terms of grandeur." ”

"It seems that this is the legendary 'Sun Mound', exactly the same as the Sun Mound that Lao Su described when he was young. However, we obviously didn't find anything in this area before, why did this sun mound pop up all of a sudden? Could it be that we went the wrong way and accidentally came to this place?" Zhang Meng said puzzled.

"The road is definitely not wrong," I said, "we didn't run too far, the weather hasn't changed, the camel trails are still running, and we have been following the camel's footprints to go back, and this area must be the area we searched before." ”

"This is the evil gate, why did this Sun Hill suddenly appear? Could it be a mirage?"

"What the hell, what's the use of just guessing here? Fat said, urging the camel to walk towards the black "little sun".

We listened to Chubby's reasoning, and urged the camel to follow Chubby to the Sun Mound.

After coming down from the big sand dunes, I walked a short distance and came to the vicinity of those "little suns". I don't know why. Looking at this sun mound from a high place gives people a very spectacular and shocking feeling, but when they are nearby, it brings people another feeling, that is, it makes people unnaturally produce a sense of "fear", in this hot desert, there seems to be a gust of wind blowing. It made people feel a biting cold, and I unconsciously shivered and got goosebumps.

"Why do I think this place is eerie?" Zhang Meng whispered.

It seems that other people feel the same way as me.

Chubby nodded: "This place is a bit evil, let's stay a little more careful." ”

We got off the camel and walked cautiously forward to one of the "little suns".

When I got closer, I saw that the black stones were the size of a fist, very round and smooth, and the stones were pure black. But it's different from coal, and it looks very oily.

None of us know minerals, we don't know what kind of stones these are.

Chubby squatted down and wanted to pick up a black stone to take a look, but strangely, the stone seemed to grow on the ground and couldn't pick it up.

At this time, Chubby seemed to suddenly remember something. I scratched my finger on the stone, raised my finger to my nose and sniffed it. Then he put it in his mouth and licked it, after which he spat and foamed.

", fat guy, you dare to taste anything, what if it's poisonous? Haven't you heard Lao Su say those weird things about Sun Hill? This place is very evil, you can't mess around." Zhang Meng said urgently.

"It's fine. It's a blessing or a curse, it's a disaster that can't be avoided, if it's unlucky, even if you don't touch anything, you can't avoid it, since it's here. It's going to be the end of it. Chubby said, walked around the sand dunes again, stomped the sand on the ground with his foot, and said, "I probably know why these rocks and sand dunes suddenly appeared." ”

"Tell me why? Zhang Meng hurriedly asked. Lao Zhang and I also listened carefully.

"Everyone," Chubby squatted down, pointed to a black stone and said, "If you look closely, there is a thin layer of white film on these black stones, I just got it down and tasted it a little, it is salty and astringent, and there is a numb feeling on the tongue, if I guess correctly, the layer on the stone is potassium salt." ”

"What's the difference between potash and the edible salt we usually eat, and what does it have to do with the sudden appearance of the sun mound?" I asked.

"Potash can be used to make potash fertilizer, and it can also be used as a chemical raw material in industry, but it cannot be eaten, and it will be poisoned if you eat too much. Chubby explained: "In China, there are very few potassium reserves. ”

Xiaopang said, paused, seemed to forget what to say, hurriedly took out a book from his arms, turned his back and looked at it, then turned around, coughed twice, cleared his throat, shook his head and continued: "Ninety percent of China's potash mines are distributed in the Taklamakan Desert and Lop Nur, among which the potash mines that have been proven and mined are mainly concentrated in the Lop Nur area, and it is speculated that there are more abundant potash resources in the depths of the Taklamakan Desert, but due to the constraints of conditions, it is not possible to explore and exploit at present. ”

As he spoke, Chubby turned around and flipped through the book again.

I secretly laughed, if it was Cheng Jiao, it would be natural to tell this knowledge, but Xiaopang would never deliberately understand and master these scientific knowledge, Xiaopang must be looking through his uncle Wang Fatzi's "Tomb Robbery Manual" again, but I feel strange that the "Tomb Robbery Manual" is used for tomb robbery, and it is not an encyclopedia, why does it record things about potash?

Fat continued: "Everyone knew about Pengamu's expedition before, and their mission at that time was to find the legendary Ancient City of the Sun according to the Loulan handscroll, and on the other hand, there was also a very important job, which was to explore the potash deposits in the Taklamakan Desert. That's why Pengamu, an agricultural chemist, rather than an archaeologist, was the head of the expedition. ”

Hearing this, I realized that Pengamu's expedition team still had such a mission, and I didn't know about it before, and I wondered, how could Xiaopang know these things? Could it be that these things were also written in the "Tomb Robbery Manual"? Is there any other secret about the expedition team led by Pengamu?

I just wanted to ask Chubby how he knew these things, Chubby smiled and said, "Of course, I didn't know about these things before, there is a 'master' to guide me, as for who this master is, this...... He didn't want me to say it. My little fat is so righteous, affectionate and righteous, honest-based, genuine, and innocent, so I have to keep it secret for him first. ”

Hearing Chubby say this, I knew that Chubby had his difficulties, so I didn't ask again.

Zhang Meng said: "You fat guy is incoherent again, it doesn't matter what kind of tall or short he is, whoever tells you has nothing to do with us." Why did this sun mound pop up all of a sudden, and what does it have to do with potash mines?"

Chubby continued: "Potash has a very important property, which is that it changes its physical properties with the change of temperature. ”

"Damn, fat guy, why did you suddenly change your style when you spoke, and became so civil, what physical characteristics are not physical characteristics, we don't understand this, you just just say why. Zhang Meng said.

I also wonder that Chubby's speech seems to be different from usual, but a bit like Cheng Jiao's tone.

"Good. In layman's terms, this potash will become different at different temperatures, some temperatures will become liquid, some temperatures will become brittle and thin, like thin ice, at some temperatures will become hard as iron, and the volume will also change with temperature and humidity. ”

"Damn, I don't think it's potash. You're talking about Sun Dasheng. Zhang Meng said jokingly.

Chubby also seemed to have some doubts about what he said, and went back to the book to look at it. Then he turned around and nodded solemnly: "That's right, potash is like that." ”

After listening to Xiaopang talk about the characteristics of potash, I seemed to understand the reason, and said: "In other words, there may be a potash mine under this area." This potash mine is quite special, or even artificially modified into a mechanism, using the characteristics of potash, the sun mound will rise or disappear from the ground at different temperatures every day. The strange phenomenon of sand swallowing people before was also due to the properties of potassium salts. ”

Chubby nodded: "I think so too." ”

"This can explain the strange thing that Mr. Su said when he came here when he was young. Lao Zhang also said on the side: " I remember that when they arrived here, they immediately dug up in the sand dunes in order to find the legendary treasure, but in the end they found nothing, he fell asleep because he was too tired, and when he woke up, the five young men who came with him and the sun mound were all gone, so it seems that it was probably because it was late afternoon when they came, that is, at this time of our time, the potash mine under the sun mound changed at this temperature, causing the sun mound to rise out of the ground, and at night, that is, when Mr. Su was asleep, the potash ore changed again under the influence of the temperature, causing the sun mound to fall back below the ground, and the five people who came with Mr. Su were unfortunately brought underground, only Mr. Su and a camel were lucky enough to stay on the ground, Mr. Su didn't know the reason, and thought that the sun mound and the five young people all disappeared out of thin air overnight. ”

"Lao Zhang's analysis is reasonable," I said: "At noon, the potash mine may have been affected by the specific temperature and humidity at that time and changed to another state, making this area become the same as quicksand, so Mr. Su was swallowed by the sand, and we almost suffered misfortune." ”

After listening to this, Xiaopang nodded frequently and said: "It seems that you really have to learn Cheng Jiao, that little girl is right, there must be a reason and reason behind anything that seems mysterious on the surface, and you still have to think about it and analyze it more." ”

I secretly laughed to myself, Chubby has always looked down on "female streamers", and now it is not easy to say such things.

"Although this can explain why the Sun Mound appeared and disappeared on its own, how can Lao Su explain the strange things that happened after he returned to the village? Also, what is the purpose of using potash ore to make such a mechanism? How did the ancients know these characteristics and principles of potash thousands of years ago? And even if they did, how did they complete such a huge project? Have you ever thought about these questions?" Zhang Meng asked on the side.

I looked at Zhang Meng with admiration, Zhang Meng had always been very arrogant in the past, unwilling to think about so many questions and reasons, it seems that after this experience, he has also changed.

"Mr. Su said that the strange things that happened when he returned to the village, I guess most of them are exaggerated, or it may be a coincidence, as for how the ancient people used the potash mine to make this mechanism, what to do with it, I don't think we need to study it now, our main purpose is to go to the Sun Ancient City, and now the Sun Mound has been found, but the guide Mr. Su has died, let's discuss whether to go to the Sun Ancient City or go home. Lao Zhang said.

It seems that Jiang is still old and spicy, and Lao Zhang usually doesn't express his opinions, but whenever it is critical, it is Lao Zhang who thinks the most clearly and can keep calm the most, which is worth learning from us young people.

Just as we were about to discuss what to do next, I suddenly felt that piercing coldness again, this coldness made me feel inexplicable fear and panic, and I saw that the faces of the others also changed, everyone looked at each other, and it seemed that the others had the same feeling. (To be continued.) )