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[[File:Figure 1.png|center|{{figure number|1|}}Remaining heat and radioactive heat<ref name=<ref name=Electropaedia />.]]

[[File:Figure 1.png|center|{{figure number|1|}}Remaining heat and radioactive heat<ref name=<ref name=Electropaedia />.]]

=== Igneos phenomena ===

=== Igneous phenomena ===

In certain regions the geothermal gradient can be increased considerably due to the magmatic process ([[:File:Strokkur Geyser,Iceland.png|Figure 2]]). Most of the areas of geothermal interest are situated in volcanic regions. In many places of our planet, hydrothermal evidence can be seen on the surface, provided that geological conditions are favorable.

In certain regions the geothermal gradient can be increased considerably due to the magmatic process ([[:File:Strokkur Geyser,Iceland.png|Figure 2]]). Most of the areas of geothermal interest are situated in volcanic regions. In many places of our planet, hydrothermal evidence can be seen on the surface, provided that geological conditions are favorable.

[[File:Strokkur Geyser,Iceland.png|frame|center|{{figure number|2|}}Igneous phenomenon the Strokkur Geyser in Iceland<ref>http://www.stewartsmithphotography.co.uk/shop/uncategorized/strokkur-geysir-national-park-iceland/ Stewart Smith Photography</ref>. ]]

[[File:Strokkur Geyser,Iceland.png|frame|center|{{figure number|2|}}Igneous phenomenon the Strokkur Geyser in Iceland<ref>http://www.stewartsmithphotography.co.uk/shop/uncategorized/strokkur-geysir-national-park-iceland/ Stewart Smith Photography</ref>. ]]