Xiaoxuan pushed away the bowl of bean sprouts with a spoon and said, "You have eaten more than 20 pieces just now. Yunfeng and Brother Yu haven't tasted it yet, so get out."
"you are a pig!"
"If you don't serve it to me, I'll catch it myself!"
"Yeah, don't grab the spoon!"
I smiled and said, Xiaoxuan, please let him eat. After he is full, he will have to rely on his efforts later.
"That's right! It's up to me to help! Give it to me!"
Bean Sprouts picked up the stuffed black sesame seeds and took a bowl for himself. He couldn't wait to take a bite, but it was too hot and burned him.
He raised his head and said with a smile: "The glutinous rice balls are ready. Brother Tian came so far and wanted to eat some."
"Forget it, I've eaten it."
This man was very open-minded. He said that since I have collected your money, I won’t ask you what you do, you just tell me when to start.
Being able to drag this man down will be of great help to our group. After all, this guy surnamed Tian has been studying Guiziling for more than ten years.
"hehe..."
Tou Tou smiled and said: "That's natural, but why don't we worry? At this moment, we have encountered some problems that we haven't figured out yet." As he spoke, Tou Tou told me about the pond poisoning that Uncle Xue and I had a few days ago.
After hearing this, Lao Tian frowned and thought for a while, then he suddenly took out a small map from his bag.
I don't understand it very well. It should be a hand-drawn geological map around Daoxian County.
Opening the map to the ground, Lao Tian said: "The ponds around Guizaipo should have underground rivers. I noticed this back then and later did a lot of research based on geology."
"Look here."
"This is the Yin-Yang Cave not far from Guizailing. In the 1970s, hundreds of stone statues were discovered in the cave. They are in the same style as those in Guizailing. I once asked my geology friends about my cave.
My friend believes that tens of thousands of years ago, the Yin-Yang Cave should have been buried under water. After the water receded, it collapsed into a valley, forming the Yin-Yang Cave."
"Hunan has a rainy season, and we discovered many karst landforms near Daoxian County. It is estimated that after the water level dropped many years ago, the underground river dropped to a deeper place."
Speaking of this, he moved his fingers slowly: "The underground river slowly flows under Guizailing. There are limestone mountains with large gaps. Rainwater seeps down along these gaps and eventually flows into the underground river.
It forms a reservoir that we can’t see.”
"If the reservoir is stored for a long time, it will dissolve the underground limestone and release a large amount of bicarbonate. Sodium bicarbonate is unstable. Once too much is deposited in the underground river, it will decompose into carbonate, carbon dioxide and water."
Having said this, he clicked on Guizailing marked on the geological map.
"There is a hole under the pond, which allows a large amount of stored carbon dioxide to spray up along the water flow. In a short period of time, the air is filled with a large amount of gas that is invisible to the naked eye, which is why you were in trouble before."
"This statement is completely valid, but there is one thing I don't understand and it has been bothering me."
Lao Tian frowned at us and asked: "To form such a high concentration of carbon dioxide, what is missing?"
Just listening to him talk, Dou Sprout didn't even swallow the glutinous rice balls he bit into.
Brother Yu and I looked at each other, eyes wide open. We don’t know.
Lao Tian said in surprise: "You don't know how simple it is? Haven't you ever gone to school?"
"This..." I said I had been there but I had forgotten about it.
Dou Yazai swallowed the glutinous rice balls in one gulp, nodded repeatedly and said: "That's right, I forgot, just tell me."
"Why....."
He sighed, looked down at the ground and whispered: "It's dilute hydrochloric acid..."
"I think there may have been something underground that rotted a lot."
