Song Siyuan nodded at everyone: "These frozen soils are not unmelting, but the melting point is very high, and simple burning will only make it melt on the surface, that is, the evaporated water droplets we see." ”

She paused, picked up a flashlight and shone the thick mist: "In this cave, there are frozen earth ice crystals tens of millions of years ago, due to the natural difference in temperature between the cave and the outside world, the frozen soil has never melted, and has been preserved in the upper layer of the cave. ”

"The underground hot river that has flowed for thousands of years can't melt the frozen soil?"

Xu Xiake was quite surprised, these hot springs were hot enough to melt the ice.

Song Siyuan nodded: "Although there is an underground hot river in this cave, due to the limited number of caves through which this hot river flows, most of the caves in the Jiuqu loop are still in a frozen state, and the natural temperature difference and rugged space inside and outside the cave also ensure that the outside temperature and hot air cannot affect here, and the only thing that can affect the temperature inside the cave is only these geothermal springs." ”

She went on to explain: "The heat produced by these geothermal springs is indeed very hot, but the heat is also easy to dissipate, these fogs are lighter, melt and absorb heat and solidify and release heat, and the fog loses heat in the process of floating, and there is basically no temperature in the upper layer, and it is easy to be frozen into frost, even if the fog can really float to the frozen soil, it will only be completely captured by the frozen soil and become a part of the frozen soil, and the ice crystal layer outside these frozen soil is probably the fog continues to form." ”

"For thousands of years, instead of melting the frozen soil, the geothermal fog has added bricks and tiles to the frozen soil, forming a new ice layer, making the cave cold all year round, directly freezing these corpses and preserving them until now,"

Song Siyuan said this and glanced at everyone: "The wonders in the cold and warm caves are probably produced in this way. ”

"Are you so sure?" Xu Xiake questioned.

After that, she looked down at the shining stones on the ground, these stones were irregular, the triangle had its own shape, it was completely unpolished, and it glowed faintly under the light of the flashlight: "See these stones, one of the conditions for the formation of crystallization of lava is the cooling of magma, these crystals are formed after the lava is cooled, and they are washed out by the underground river, forming what we see." ”

"These lava crystals at least prove that there was really geological movement here, plus several ice ages on the earth. Permafrost is also a good reason. ”

"I'm more worried about not these, but what happened to the Ghost World, we have to hurry out of the bamboo forest to the tidal land, the situation along the way tells me that the Ghost Fang people are likely to have disappeared, otherwise, how could they let Ah Xi go away."

Song Siyuan's worries were not unreasonable, and the Ghost Fang Sect nodded: "I think so too, fortunately, it's almost here, we have to hurry up." ”

Worried about this, they returned to the carriage and went out of the cold and warm hole along the river, but fortunately the arrow bamboo forest did not encounter any danger, and they probably crossed the bamboo forest for half a day, and arrived at the tidal land in the evening.

The carriage came out of the arrow bamboo forest, and it had already come to the deep mountain canyon where the tidal land was!

Here is much wider than the canyon where the ghost language forest is located, the peaks are arranged in a circular pattern, the tall peaks are connected with each other, forming an unclimbable mountain, the mountain is no longer like Danxia land without grass, covered with verdant vegetation, the highest place is green and yellow, exposing the weathered rock layer.

They looked back, neighboring a huge lake in the canyon.

As mentioned earlier, this lake is completely horizontal in a deep mountain canyon, with thousands of high mountain peaks on both sides of the canyon, and a rushing lake at the bottom of the valley

It was almost dusk at the moment, and they were standing on the shore, and they could see the bottom of the lake at a glance, probably only near the calf, and the water grass carp and shrimp could be seen clearly.

Yue Guanchao observed the surrounding canyons and said, "These canyons are almost closed, there are no tributaries or waterfalls, in this case, can the water really rise with the moon?" ”

Ghost Fang Sect said that at night, the lake can be seen to become high and deep, and even directly overflow the trees on both banks, forming an extremely wide giant river, submerging all the living people who have time to escape in the future.

"We're afraid we have to explore first to find out about this situation."

Yue Guanchao and the others took off their shoes and socks, took a few steps forward, first picked up the sapper shovel and tested the hardness of the bottom of the lake, and made sure that it was not silt or swamp before jumping into the water.

It is the spring and summer communication, the lake water is very shallow, and it becomes extremely warm after being exposed to the sun for a day, as if it is hot and suitable for washing feet, and the warmth soaks the surface of the feet when walking, only to see the aquatic plants fluttering wantonly, wrapped around the calves.

They looked for about a few tens of meters according to the place where they went into the water, and there was no hole in the bottom of the lake except for silt, and it was almost impossible to find the whole lake, so they had to go ashore first.

Song Siyuan saw that they found nothing, and became curious: "If there are no undercurrents and caves at the bottom of the river, and there are no waterfalls around, then how does the water rise?" Or rather, the legend of the rising water is false. ”

Thinking of this, her eyes lit up: "If the water rises and falls every day, it will probably leave traces on the surrounding mountain walls, let's take a look at the traces on the surrounding mountains." ”

After that, Yue Guanchao took them to the mountain by the lake and began to check the traces of the mountain.

If the tide rises at night, there will be traces of the surrounding mountains soaking the lake for many years, and even if the water falls during the day, it will definitely leave traces of the previous night's water.

With this in mind, they began to inspect the rock formations and soil around them, and what they found was indeed very surprising.

After Yue Guanchao and Song Siyuan met, they glanced at each other, and her eyes were obscure and said: "I think that these soils are completely dry, and there are no water marks even on the rock formations, which means that there are no traces of water surface fluctuations at all. ”

"How is that possible?"

They told the Ghost Fang Sect the result, and the ghost old man was also very puzzled: "If there is no rising water, is it also false that the sun and the moon are declining and the tides are rising?" ”

Right now, the situation they face is getting tricky.

Song Siyuan waved his hand: "It's not necessarily fake, this thing is part of the terrain created by the ancients, probably the sun and the moon are ebbing and the tides are rising, referring to other things." ”

"Fortunately, the time is not early, and it is estimated that the truth will be revealed in the evening, so we will hide in the bushes by the lake first."

When the situation changed, they had no choice but to hide first, and when the sun went down after sunset, everything around them was hidden in the darkness, leaving only the moon that had just climbed overhead, glowing dimly and hanging obliquely on the clouds.

The place where Yue Guanchao hid was a bamboo forest not far from the lake, and no one could find him by relying on shrubs to cover it.

At this moment, everyone is lying in the bushes, staring at the lake with curious eyes, except for the chirping of insects and the slumping of trees, basically no sound can be heard, and the lake in the distance reflects the moonlight, reflecting the trembling light, this appearance is not very strange, as for the lake rising water, it is not encountered at all.

About two hours later, the moon faded and the hazy veil hung high in the sky, and there was finally other movement around them, and the bamboo forest began to rustle!

"Is there something moving in this voice?"

Yue Guanchao's ears were extremely effective, and he had already noticed that the bamboo forest was swaying, and it was definitely not the wind blowing the trees, but being shaken by something from the ground.

"Is it a giant?" Xu Xiake said curiously.

Song Siyuan picked up the copper basin and covered it on the ground, and after her ears were close to the copper basin, many noises were shielded by the copper basin, and the sound from the ground clearly came to her ears.

"How can there be the sound of water underground?"

When Yue Guanchao heard this, he leaned on the other side and listened carefully, there was indeed a sound of water coming from a depth of dozens of meters underground, and his eyes were puzzled: "It's probably the movement of the groundwater, could it be that we guessed wrong, the lake is really going to rise?" ”

"It doesn't have to be a rising water? What if it's overboard? ”

With that, she picked up the binoculars and looked at the lake, which gradually churned, and it was obvious that the lake was disappearing.

The appearance of this scene confirmed Song Siyuan's guess, but at the moment of speaking, the water in the huge lake had already bottomed out, and even began to reveal the sand of aquatic plants at the bottom.

Xu Xiake suddenly realized and said: "It seems that we still haven't found the right place, there should be an undercurrent or a cave at the bottom of the lake, otherwise it would not be possible to go into the water so quickly, but what does it mean that the lake has fallen?" Why is it the opposite of the legend? ”

Song Siyuan looked around and said, "Keep looking, judging from the movement I heard in the copper basin just now, the underground of the lake is connected with this bamboo forest, most of which is because the water level of the underground karst cave has decreased, and even the water in the lake has been absorbed." ”

The crowd continued to wait in the bushes, and when the water level had completely dropped, fireflies began to emerge from the cave of the lake, like stars in the night, floating near the dry lake.

However, after a while, the fireflies gradually increased, gushing out from the underground cave like a waterfall, like a shining waterfall, gradually enveloping the surface of the lake, as the fireflies on the lake surface accumulated, the fluorescence finally completely filled the lake, spreading to the waist of the canyon.

The fluorescent ripples and the flow does not stop, and they see that the canyon is filled with fireflies like rising water, and they basically understand what the sun and the moon are rising and the tides mean.

This scene made everyone wonder: "So that's what it means?" But what exactly are these fluorescences? ”

"This light, it can't be those human-faced bugs again, right?"

Yue Erpao's words made everyone's hearts tighten, and no one could escape from a large number of human-faced bugs.

Yue Guanchao nodded and said: "No, the human-faced bugs attack living creatures for hunting, these should just be ordinary fireflies, and they should be eating mayflies and water insects left on aquatic plants when they appear here." ”