Is there a fire in the hot spring?

Generally speaking, the formation of hot springs requires the following three conditions:

(a) There must be hot water underground;

(2) There must be a hydrostatic pressure difference leading to hot water upwelling;

(3) There must be deep and long cracks in the rock before hot water can reach the ground.

Formed by magmatism in the earth's crust or accompanied by volcanic eruption;

The second is formed by the infiltration and circulation of surface water.

There is no fire, the key is geothermal!