The ice cave 3 million years ago was only 400 meters away from the volcano. What is the temperature in the cave?

There is an ice cave on Guancen Mountain at an altitude of 2800 meters in ningwu county, Xinzhou City, Shanxi Province. Ice caves were formed in the fourth glacial period of Cenozoic era, with a history of 3 million years. The temperature in the cave is kept at MINUS 4 degrees to MINUS 6 degrees all the year round.

Surprisingly, there is an active volcano about 400 meters south of the ice cave. According to historical records, the volcano here has been burning since the Song Dynasty, with a history of 1000 years.

Extended data

Conditions and related phenomena of ice cave formation

First, the conditions for the formation of ice caves

1, there must be two outlets, and there must be enough height difference between the two outlets, and the seal between them is good.

2. There must be a certain water source in the lower part of the hole, and the cold air entering the hole is not enough to completely condense it.

The weather below 3.0℃ is long enough

4. The upper outlet is on the shady side of the mountain or in the ravine.

The mountain near the ice cave is steep, but the rest of the mountain is high and there are no big gullies.

Second, other phenomena related to ice caves.

In winter, the airflow in the cave goes up, and the saturated airflow flows out of the cave and condenses in the cold air. In winter when the relative humidity is low, the icing phenomenon will appear first.

In summer, when the airflow in the cave drops, a relatively cool microclimate will be formed at the exit or spring water with lower than normal ground temperature will flow out.

North night new vision network-true fire and true ice! The 3 million-year-old ice cave is only 400 meters away from the volcano, and netizens call it magic.

Baidu Encyclopedia-Wannian Ice Cave