Changes

[[File:Figure 1.png|200px|thumbnail|right|Figure 1: Remaining heat and radioactive heat [http://www.mpoweruk.com/geothermal_energy.htm].]]

[[File:Figure 1.png|200px|thumbnail|right|Figure 1: Remaining heat and radioactive heat [http://www.mpoweruk.com/geothermal_energy.htm].]]

=== Remaining heat and radioactive heat ===

=== Remaining heat and radioactive heat ===

* '''Geothermal Gradient''' is called to the variation of temperatura according to depth rocks are.It is read in Celcius or Farenheit grades by the unit of vertical distance.The gradient in our planet is quite variable and it depends on different causes.

* '''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 continuosly comes up to the surface.It is read in Joules per Second.It is estimated that the average is 42x1012J/seg and has two different sources:

* '''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:

* '''Remaining heat release''':It is 34x1012J/seg. It comes from the [[Mantle]] and the Nucleus and it is the remaining heat 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''':It is 8x1012 J/seg. It comes from the Crust and it is produced by the fission of radiactive isotopes.

** '''Radioactive heat release''': 8x1012 J/sec. It comes from the [[crust]] and is produced by the fission of radioactive isotopes.

See Figure 1

See Figure 1