Changes

: They are found in sedimentary basins with normal o hightly superior geotermal gradient.The sole condition is the existence of one or more aquifer horizons in adequate depths.Ej Paris Basin (France) ;Boise (EEUU) (Figure 4). [[File:Goethermal heating district, City of Boise, EEUU.png|thumbnail|center|Figure 4: Goethermal heating district. City of Boise. EEUU. [http://energy.ltgovernors.com/geothermal-resource-descriptions.html].]]

: They are found in sedimentary basins with normal o hightly superior geotermal gradient.The sole condition is the existence of one or more aquifer horizons in adequate depths.Ej Paris Basin (France) ;Boise (EEUU) (Figure 4). [[File:Goethermal heating district, City of Boise, EEUU.png|thumbnail|center|Figure 4: Goethermal heating district. City of Boise. EEUU. [http://energy.ltgovernors.com/geothermal-resource-descriptions.html].]]

=== Medium temperature deposits (90ºC<T<150ºC) ===

=== Medium temperature deposits (90ºC<T<150ºC) ===

: They are foundin various places of our planet.They usually belong to áreas with specific geologic characteristics such as áreas of thin crust,higher concentration of radioactive isotopes or áreas close to or near igneous bodies.They can also be found over regions with higher gradient but a lower depth.They generally need an igneous intrusión and it is usual that,in this kind of field,water comes up to the surface forming hot springs.

: They are foundin various places of our planet.They usually belong to áreas with specific geologic characteristics such as áreas of thin crust,higher concentration of radioactive isotopes or áreas close to or near [[igneous]] bodies.They can also be found over regions with higher gradient but a lower depth.They generally need an igneous intrusión and it is usual that,in this kind of field,water comes up to the surface forming hot springs.

=== High temperature fields (T>150ºC) ===

=== High temperature fields (T>150ºC) ===

: These deposits are found in áreas of higher igneous activity.They are related to extremely high gradients, corresponding to global tectonic process.They occur in plate borders, cortical thinnes áreas or Hot Spots. They need an igneous source an aquifer and a impermeable layer to keep up pressure. In many cases there is surface evidence suchs as geysers and fumaroles, [[File: Simplified diagram of a geotermal power plant.png|thumbnail|center|Simplified diagram of a geotermal power plant. [http://www.bgs.ac.uk/research/energy/geothermal/].]]

: These deposits are found in áreas of higher igneous activity.They are related to extremely high gradients, corresponding to global tectonic process.They occur in plate borders, cortical thinnes áreas or Hot Spots. They need an igneous source an aquifer and a impermeable layer to keep up pressure. In many cases there is surface evidence suchs as geysers and fumaroles, [[File: Simplified diagram of a geotermal power plant.png|thumbnail|center|Simplified diagram of a geotermal power plant. [http://www.bgs.ac.uk/research/energy/geothermal/].]]