Re: why does Earth and Io have magma?


"Androcles" <Engineer@xxxxxxxxxxxxxxxx> wrote in message news:Ms0oi.269$2U6.21@xxxxxxxxxxxxxxxxxxxxxxxxxxxx

"The Chief Instigator" <patrick@xxxxxxxxxxxx> wrote in message
news:szkd4yn1ndu.fsf@xxxxxxxxxxxxxxx
: "Landy" <noone@xxxxxxxxxxx> writes:
:
: ><granite_ston020181@xxxxxxxxx> wrote in message
: >news:1184890800.280488.31830@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
:
: >>> The moon causes Earth magmatism? Well that's a new one!
: >>> cheers
: >>> Bill
:
: >> Yes the moon does cause Earth's magmatism! As the moon rotates the
: >> surface of Earth, the surface bends which creates magma.
:
: >What a load of absolute bollocks.
: >cheers
: >Bill
:
: I wonder why he hasn't claimed that it can be found on Jupiter, Saturn,
and
: Mars, all of which rotate with a speed similar to (or quite a bit faster
than)
: the rock we're sitting on...

Jupiter and Saturn are gas giants, Mars has two very small moons.
If you don't know what effect our Moon has on Earth spend a
day in the Bay of Fundy or the Bristol Channel and watch the
tides. The same force that makes water rise and fall in our oceans
also acts on the lithosphere, and a jacuzzi full weighs a ton.
The total prat "Bill" is a load of absolutely useless ignorant
bollocks and you are just another sucker taken in by the troll.
Cheers,
Androcles


Well, I'm still confused.

The claim appears to be that the Moon's tidal forces heat the earth, which causes the magma to heat up and increase volcanism.

Firstly, it would appear very plausible to say that the deformation caused by tidal forces increases vulcanism, by repeatedly opening and closing cracks through which lava can erupt. I have no idea if this is true or not, but its certainly plausible.

However, this is not the claim - its the heating caused by tidal forces. This seems unlikely, but is a very good question. The heating is equal to the total loss of kinetic and potential energy in the earth moon system. The moon is retreating at 3cms a year, and its pretty big, so this is some energy at least. How much - any idea? And where does it go - mostly to heating the earth, or mostly to heating the moon? I would assume that the component going to the earth would overwhelmingly be "dumped" into the oceans, as this is where tidal friction occurs. This is a far smaller "pool" to dump the energy in than is the entire earth, so the heating effect may be non-trivial. Does anybody have any idea what happens to that energy, and how much of it there is?

(Although I doubt its enough to create magma).


.

Relevant Pages

  • Re: Lunar Space Elevator simply isnt for everyone
    ... As to an LL-1 based sizable asteroid tethered to the Moon, ... You do realize that a millionth of the surface area of mother Earth ... About energy, uh, there is a lot of recycling to be done. ...
    (sci.space.policy)
  • Re: Temperature on global warming turned up
    ... Global Warming is for real, and it's real in more ways than one. ... of the vast amount of required energy, ... obtained moon, which isn't discounting the 10% impact as caused by ... all departed this Earth and let nature and the laws of physics take its ...
    (sci.space.policy)
  • Re: USA urges scientists to block out sun
    ... our's to deal with as of the last ice age this planet will ever see. ... Take away our moon and Earth gets cold. ... it still has our polluted and energy raped ...
    (sci.space.policy)
  • Re: Temperature on global warming turned up
    ... if we all departed Earth and let ... that pesky moon of ours, ice age trapped methanes and CO2 will in fact ... energy into our environment by way of tidal forces, ... planetoid, as our solar shade instead of being a pesky moon. ...
    (sci.space.policy)
  • Re: Noethers Theorems (1918) in English translation
    ... >>momentum is from the Earth to the Moon. ... There is a net energy ... transfers energy up (rotation rate of earth> rotation rate of moon, ...
    (sci.physics.relativity)