，

When he walked in, Zhou Zhixue did not walk behind Zhao Xuezhen as Li Qingqing said.

He was still a very gentleman walking in front of Zhao Xuezhen, holding a mobile phone with a flashlight in his hand, and at the same time guiding Zhao Xuezhen behind him to walk forward.

When Zhao Xuezhen stood in front of the entrance of the cave in Heibu Longdong, she was actually a little scared in her heart, but when she saw that Zhou Zhixue was opening the way in front of her, and there was Lu Nan pressing the formation in the back, she was quite a little more settled.

"Zhou Zhixue, you go slowly!" After Zhao Xuezhen finished speaking, she turned back to Lu Nan and said, "Lu Nan, you follow me." ”

"Okay." Lu Nan nodded, Lu Nan could see that Zhao Xuezhen was a little scared.

"Hurry in." Li Qingqing, who had already walked in, shouted inside, her voice spreading back and forth in the cave, and there was a buzzing echo.

"Slow down." Zhou Zhixue, who was following them, shouted.

"It's okay, you guys hurry up and keep up." He Guomin, who was walking in the front, turned around and waved his mobile phone to the back, and the flashing light on the mobile phone was still relatively bright in the cave.

After all four of them went in, Lu Nan also walked in.

He didn't need a flashlight or anything, and when he opened his eyes, there was nothing he couldn't see.

If anyone knew that he used such a supernatural power as a lamp, it was estimated that he would lose his eyeballs, but for Lu Nan, no matter what supernatural power he had, as long as it could provide him with convenience, it would be a good supernatural power.

Unlike Li Qingqing, who could only use the light of their mobile phones to see the road in front of them, after Lu Nan opened the Tianyan Pass, he could clearly see everything in the cave.

This cave is very large, Lu Nan roughly looked at it, as far as they are now, it is like a huge warehouse, the upper and lower spaces are actually more than ten meters, and the inside is even more unfathomable.

Just here, I feel that there is no problem at all to accommodate one or two thousand people, and it is the size of a school auditorium.

And looking inside from here, there are countless small holes on the rock wall, and there are all kinds of peculiar stones around the cave, row upon row, and there is an optimus jade pillar in the middle, which is breathtaking!

The various stone pillars inside the cave are smooth and resemble clumps of stalagmites, which are covered with a cream-like substance.

"Wow! It's so big. After walking in, Li Qingqing and He Guomin temporarily stopped their pace, they held their mobile phones to shine everywhere in it, but with the light of the mobile phone flashlight, they couldn't see the edge of the cave at all.

"Wait, I'll throw a stone and try." He Guomin squatted down, picked up a stone on the ground, and planned to throw a stone to ask for directions.

"Boom!"

He Guomin didn't use much force, he threw it forward casually, and after waiting for a while, he heard the sound of stones falling to the ground.

"Hey, I didn't touch the wall, isn't it far away?" Li Qingqing said on the side.

Zhao Xuezhen also walked to their side and said, "Doesn't the book say that the cave is an approximate horizontal cave formed by dissolution and erosion, with a depth of no more than 10 meters. ”

"No more than 10 meters?" He Guomin said: "The stone I threw just now is more than ten meters, I'll throw another one." ”

"Boom-"

He Guomin picked up another stone and threw it forward, this time he used all his strength, and the stone flew out with a swish, and waited for a while before hearing the sound of the stone falling to the ground.

"That's obviously more than ten meters." Li Qingqing said on the side.

"However, there is also an opinion about the formation of caves, which is that these caves are not naturally formed, but are built by living organisms." Zhou Zhixue said.

"Creature-built?" Zhao Xuezhen asked, "What creature built it?" ”

Zhou Zhixue said: "Last time I read in an article, some scientists said that the formation of karst caves is very closely related to algae organisms, and on this basis, a new theory of biological construction of karst cave formation was proposed. ”

"What kind of creature built it? Dinosaurs? Li Qingqing asked with a smile.

Zhou Zhixue shook his head, although they couldn't see him shaking his head, Zhou Zhixue said: "The bioconstruction theory believes that algae are the earliest and still widely distributed primitive plants on the earth, and they have the ability to synthesize and grow at light like other plants. ”

"Not a dinosaur?" Li Qingqing was disappointed: "It can't be some kind of monster or something, like a vampire or something." ”

In such a dark environment, there are only a few mobile phones, and it is still very interesting to talk about something that makes people scared.

Anyway, He Guomin was by her side, and Li Qingqing was not afraid of anything.

Zhou Zhixue didn't bother with Li Qingqing's troublemaking, anyway, he didn't say it to Li Qingqing, mainly to Zhao Xuezhen, because he saw that Zhao Xuezhen seemed to be more interested in this.

He continues, "Because they secrete calcium as they grow and develop, they can collect, bond fine calcareous particles, and often live in clusters. ”

"A lot of algae grows together from generation to generation, creating many reefs of marine life. The stalactites in the cave are almost always bent upward towards the light, which is in line with the phototactic growth characteristics of algae. ”

"Stalactites and stalagmites also have concentric circles like tree rings inside them, which in turn can be understood as the result of algae organisms growing, secreting, collecting and bonding calcareous particles over the years."

As he spoke, Zhou Zhixue also used a flashlight to illuminate the surrounding environment, found a stone pillar, stroked the stalactites with his fingers, and looked for traces of those creatures on the ground.

"In addition, layered fossil structures similar to ancient algae organisms have been found in the rocks of some caves, and a variety of algae are still growing on the surface of some caves......

"Okay, Zhou Zhixue, don't talk about it, you really should be a teacher, it's the same as Tang Seng chanting." Li Qingqing couldn't help but be bold and knowledgeable.

"Poof!" Zhao Xuezhen was originally quite interesting to hear, but when she heard Li Qingqing say that Zhou Zhixue was like a Tang monk chanting, she couldn't hold back her laughter all of a sudden.

"Hahaha, okay, shall we continue to move on?" He Guomin also laughed.

"Let's go, let's go, let's go to the end!" Li Qingqing said with great interest.

Then they continued to walk forward, but when they had not gone far, Li Qingqing was in a problem.

"Oops!" Li Qingqing suddenly exclaimed.

"What's wrong?" He Guomin hurriedly asked.

Li Qingqing said with a crying voice: "I twisted my foot." ”

"Sit down." He Guomin hurriedly helped Li Qingqing to sit down, and Zhao Xuezhen and Zhou Zhixue also hurriedly went up to help.

"Why don't we go out first, we can't see clearly in here." Zhou Zhixue said.

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