🚀 go-pugleaf

Landy wrote:

> 
> "Addinall" <addinall@addinall.org> wrote in message
> news:1167544085.362178.229360@42g2000cwt.googlegroups.com...
>>
>> Landy wrote:
>>> "David Moss" <q0320811@mail.connect.usq.edu.au> wrote in message
>>> news:MPG.2000942a106031ce98a258@news.bigpond.com...
>>> > In article <en4jub$rl8$1@news-02.connect.com.au>, dontemailme@all.com
>>> > writes...
>>> >
>>> >> So tell me what's wrong with this form of energy as an alternative to
>>> >> coal?
>>> >
>>> > Isn't geothermal just another kind of nuclear energy?
>>> >
>>>
>>> Well yes, but one is nuclear fission and the other is not.
>>
>> Nope. Both fission.  Exactly the same process the Green
>> nuts get all pantieless over.  What's more, it's not
>> contained.
> 
> No it is bloody not fission - see my reply to Greg and you might learn
> something.

http://tinyurl.com/y3tw4v

Where Does Geothermal Energy Originate From?

The heat in the Earth's crust comes from three main sources:

   1. Solar radiation - Ground temperatures down to about 10 metres show
seasonal variations and so most of that heat is solar energy from the sun.
   2. Heat conducted from the underlying layers - Heat from the layers below
the crust (the mantle and core) conduct heat outwards towards the surface.
On average, the temperature increases 25�C every kilometre below the
surface. As well as this, heat may be brought up to the surface through
cracks in the earth in the form of molten rock or lava during volcanic
eruptions.
   3. Radioactive decay - The major source of geothermal heat in the crust
(from 50 to 75%, depending on the location) is the radioactive decay of
elements such as uranium, potassium, and thorium. Although the heat
released is quite small, the enormous mass of radioactive material in the
earth produces so much heat that, in some places, it can melt solid rock
and produce magma. The decay of the elements may occur slowly over huge
periods of time (eg Potasium-40 has a half life of 1.3 billion years) or in
Stages (eg Uranium-238 decays through 14 stages before becoming the table
element lead).

-- 
Regards,

Gregory.
"Ding-a-ding-dang,My Dang-a-long ling-long"