Perhaps because the authorities were obsessed with bystanders, Xing Tianqi glanced around several times and didn't find anything, but a few viewers in the live broadcast room found something.

"Anyway, why did Doudou bring the anchor here?"

"Does Doudou like waterfalls?"

"Pull it down, my squirrel hates water the most."

"Hey, look, there's a hole in the back of the waterfall?"

"What hole?"

"Damn, really, it's right below the waterfall, less than a meter high from the pool."

"I saw it, I saw it, is this Huaguo Mountain?"

"Water Curtain Cave, Sun Wukong lives in it, Brother Tian, go and fight with Wukong!"

Xing Tianqi has long been accustomed to paying attention to the light curtain hanging from the drone from time to time during the live broadcast.

Naturally, he also saw the topic they were discussing at this time, so he also looked along the place they described, and after a closer look, he saw the water curtain cave they were talking about.

Immediately, Xing Tianqi understood, it seemed that what Doudou found was in this water curtain hole.

At this time, not to mention the curiosity of the audience in the live broadcast room, even Xing Tianqi was a little curious about what would be in it.

So without waiting for the audience in the live broadcast room to urge, Xing Tianqi was ready to take the golden lion in, although he didn't think that there would be any great danger in this water curtain cave, but it was better to take the golden lion with him, just in case.

"I was lucky enough to find a hole behind the waterfall, and not only are you curious, but I'm also curious about what's inside, so I'm going to explore."

Saying that, Xing Tianqi put the Doudou on the ground into a pocket on the chest of his jacket, only his head was exposed, and let Qiuqiu also get into the waterproof backpack and zip it.

Of course, he did not forget to control the drone to fly down, grasp it in his hand to shoot, and then move his body in place, then holding an extended stick in one hand and holding the drone in the other hand and walking into the water step by step from the edge of the waterhole.

The slope of the waterhole is very steep, and Xing Tianqi just took two steps, and half of his body was submerged in the water, but it was not very deep, and it was only a little more than a meter.

Immediately after that, with the sound of plopping, the golden lion also jumped in from the waterhole, and quickly swam in front of him in the water in the posture of a dog, playing the role of a bodyguard.

The waterhole is only more than 100 square meters in total, and the diameter is naturally not very large, even if there is a torrent from top to bottom, it only takes a minute or two to reach the waterfall.

Xing Tianqi was full of curiosity about the hole behind the waterfall, and with a horizontal heart, he climbed into the back of the waterfall with a top-down waterfall.

Behind the waterfall, there is a space concave, only a few square meters, and the feet are covered with mossy stones, which are very slippery, and you have to hold on to the rocks to barely stand up.

With the sound of rushing water, the golden lion's body drilled in from the water curtain, and as soon as he stood firmly, he subconsciously shook his body hard.

Suddenly, a series of water droplets splashed everywhere, drenching Xing Tianqi's body, but anyway, he was all wet, and he didn't care about it.

Then Xing Tianqi looked inside, there was a hole less than two meters in diameter, the black hole didn't know where it led, and there was a trickle of water flowing out of the hole, and the water of the waterfall converged and flowed into the pool.

Xing Tianqi pulled the ball out of his backpack, let it follow him, and by the way, he took out the miner's lamp belt and put it on his head, aimed at the hole in front of him, and suddenly a strong light illuminated the place as bright as day.

At this time, the audience in the live broadcast room began to be inexplicably excited.

"Ah, I'm looking forward to what's in the swarthy hole!"

"There's water in the hole."

"Don't be so dirty, okay?"

"Where's the dirt? Don't you see water coming out of the hole? ”

"Uh......"

Xing Tianqi leaned at the entrance of the cave and listened, and there was no other sound in it except the sound of water.

"I don't know what dangers are inside, it's best for everyone in the wild not to enter this unknown cave like me, I have something to rely on, protected by a golden lion. But you can't, and if something happens, it's too late to regret it. ”

After speaking, Xing Tianqi took the golden lion and stepped into the cave, and suddenly a cold wind that was not strong came to his face, and there was a very thick water vapor.

The cave was damp and dark, the further inside, the quieter it became, except for the footsteps and breathing of Xing Tianqi and the golden lion, there was no other sound, and the sound of flowing water outside was in stark contrast, eerie and a little terrifying.

This somewhat calm atmosphere made the audience in the live broadcast room widen their eyes and quieted down, and the barrage rarely began to calm down.

The cave was not too deep, it was probably less than twenty meters, and when it reached the other end, it suddenly became open.

", it's a cave!"

"It's pretty here!"

"We have a Liu Xiudong here, which is much more beautiful than here."

"It's so beautiful!"

It turned out that in front of him was a rather huge karst cave, with huge stalactite pillars and equally magnificent stalagmites staggered and straight in the hollow, like guards guarding this place for eternity.

They seemed to become translucent under the illumination of the pillars of light, and the ground was rocky and full of interlaced springs and streams.

With the help of the illumination, Xing Tianqi carefully observed the cave, and he found that the location of the cave was actually under the waterfall river, because there was constantly water flowing down from the inside and top of the cave, causing the cave to be full of trickles of dripping water, forming small puddles of different sizes on the potholed ground.

"Brothers, I believe you should remember that when you went to school to study chemistry, calcium carbonate has such a property that when it encounters water dissolved in carbon dioxide, it becomes soluble calcium bicarbonate. Like natural river water or well water, it often contains impurities such as calcium bicarbonate, magnesium bicarbonate, calcium sulfate, magnesium sulfate, etc., if the content is large, this kind of water is called hard water.

Hard water is not suitable for industrial water, because it will form scale when heated and decomposed in the boiler, resulting in poor heat conduction, waste of fuel, and even accidents. Hard water is also not suitable for drinking, if you drink it for a long time, you will suffer from digestive system and urinary system diseases, and washing clothes with hard water will also have a poor washing effect.

When the water dissolved with calcium bicarbonate drips from the top of the cave to the bottom of the cave, due to the evaporation or pressure reduction of water, as well as the change of temperature, the solubility of carbon dioxide will decrease and the precipitation of calcium carbonate will be precipitated, which will gradually form stalactites and stalagmites after millions of years of accumulation.

Nature has repeated these reactions for a long time and many times, resulting in the formation of various strange and spectacular karst caves.

For example, the world-famous Guilin Cave, Beijing Shihua Cave, and Loudi Meishan Dragon Palace are masterpieces created due to the slow erosion of water and carbon dioxide. ”