Question

What is Geothermal or spring ?

Answer 1

A hot spring is a spring produced by the emergence of geothermally heated groundwater that rises from the earth's crust While some of these springs contain water that is a safe temperature for bathing, others are so hot that immersion can result in injury or death.

Sources of heat

Water issuing from a hot spring is heated geothermally, that is, with heat produced from the Earth's mantle. In general, the temperature of rocks within the earth increases with depth. The rate of temperature increase with depth is known as the geothermal gradient. If water percolates deeply enough into the crust, it will be heated as it comes into contact with hot rocks. The water from hot springs in non-volcanic areas is heated in this manner.