Changes

=== Remaining heat and radioactive heat ===

=== Remaining heat and radioactive heat ===

* '''Geothermal Gradient''' is the variation of temperature according to a rock's depth. It is read in Celsius or Fahrenheit grades by the unit of vertical distance.  

* '''Geothermal Gradient''' is the variation of temperature according to a rock's depth. It is read in Celsius or Fahrenheit grades by the unit of vertical distance.  

* '''Surface Heat Flow''' is the heat that continuously comes up to the surface. It is read in joules per second. It is estimated that the average is 42 x 1012 J/sec and has two different sources (See [[:File:Figure 1.png|Figure 1]]<ref name=Electropaedia>[http://www.mpoweruk.com/geothermal_energy.htm Electropaedia]</ref>):

* '''Surface Heat Flow''' is the heat that continuously comes up to the surface. It is read in joules per second. It is estimated that the average is 42 x 1012 J/sec and has two different sources (See [[:File:Figure 1.png|Figure 1]]):

** '''Remaining heat release''': 34 x 1012 J/sec. It comes from the [[mantle]] and the nucleus and is the heat remaining after the formation of the planet.  

** '''Remaining heat release''': 34 x 1012 J/sec. It comes from the [[mantle]] and the nucleus and is the heat remaining after the formation of the planet.  

** '''Radioactive heat release''': 8 x 1012 J/sec. It comes from the [[crust]] and is produced by the fission of radioactive isotopes.  

** '''Radioactive heat release''': 8 x 1012 J/sec. It comes from the [[crust]] and is produced by the fission of radioactive isotopes.  

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

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

=== Igneous phenomena ===

=== Igneous phenomena ===