Naturally hot water containing many minerals and found on the surface of the earth is called a hot spring.

Here's why:

* Hot: The water is heated by geothermal activity, meaning heat from the Earth's interior.

* Naturally Occurring: They are not man-made.

* Minerals: The water dissolves minerals from the rocks it passes through, giving it its unique properties.

* Surface: Hot springs are found at the surface of the Earth, often in areas with volcanic activity.

Some other terms you might hear are:

* Geothermal spring: This emphasizes the heat source.

* Thermal spring: This is a general term for any spring with warmer-than-average water.

* Mineral spring: This highlights the dissolved minerals.