A hot spring
Is a spring produced by the emergence of emergance of geothemally heated groundwater that rises from the Earth's crust. Some of these springs contain water that is a safe temperature for bathing.
Geyser is a spring characterized by intermittent discharge of water ejected turbulently and accompanied by steam. As a fairly rare phenomenon, the formation of geysers is due to particular hydrogeological conditions that exist only in a few places on Earth. Generally all geyser field sites are located near active volcanic areas, and the geyser effect is due to the proximity of magma.
In Thai, We mostly found the tourist attraction with hotspring in the north of the country, such as Chiang-Mai Karnjanaburi Etc.
Sources of heat
Much of the heat is created by decray of naturally radioactive elements. An estimated 45 to 90 percent of the heat escaping from the Earth originates from radioactive decay of elements mainly located in the mantle.
Water issuing from a hot spring is heated geothermallu, 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-volcanicareas is heated in this manner.
Because heated water can hold more dissolved solids than cold water, warm and especially hot springs often have very high mineral content, containing everything from simple calcium to lithium and even radium. Because of both the folklore and the claimed medical value some of these springs have, they are often popular tourist destinations, and locations for rehabilitation clinicsfor those with disabilities.