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from underground
hot underground pools of water
geothermal
steam in the earth
underground heat
Aquifer
aquifer
A geothermal pool is called a reservoir.
The heating of underground water by magma is called geothermal activity. The word geothermal comes from the Greek geo meaning "Earth" and therme meaning "heat".
It is called the geothermal gradient, which means that the closer to the mantel or core (underground) you go, the hotter it gets.
from underground
hot underground pools of water
geothermal
It is called a hot spring or geothermal spring.Where water is heated to steam underground, and erupts in a spray, it is called a geyser.
underground heat
steam in the earth
underground heat