Originally posted by 7ate9Volcanoes are formed where you have two plates rubbing togther, normally a little back from the subduction zone. The action of rubbing together causes a zone of weakness. This can rupture, especially if the mantle is highly volatile below this area (which is practically guarenteed), and pressurised magma is ejected. It is this which causes the formation of volcaloes. Their particular conical shape is simply a result of the magma flowing outwards from it's source.
no it doesn't because whatever i imply does not change what is. volcanoes get formed and basic common sense says if the land was one mass then huge volcanoes would be formed.
Originally posted by 7ate9Just because you have one land mass doesn't mean it's all on the same plate. And yes, actually you will need science to understand it. It's called plate techtonics. Centrifugal forces might explain things like the bulging of the atomosphere around the equator and the coriolis effect, but not volcanoes!
one land mass, then it is different? why would it be different from what happens here in NZ? i don't think it makes any difference with one land mass, as it is just a bigger situation of a smaller situation. i don't need any science to understand this fact.
- Joined
- 31 May 06
- Moves
- 1795
It is possible for an object to experience centrifugal force, and therefore it can be said to be as much in existence as any other force. (While it is true that it is a common mistake to claim that a centripetal force is a centrifugal one, it does not mean that the centrifugal force does not exist).
Volcanoes, like everything else on Earth are pulled downward by gravity (centripetal) and held up by the electromagnetic force (as this force is acting outwards it could be said to be centrifugal, in this case). Due to the earths rotation the effective weight of objects at the equator is lower than at the poles. This is due to the fact that the objects have achieved a small fraction of escape velocity (and for this reason space agencies tend to prefer launching near the equator) and are partially in orbit. This reduction in downward force reduces, very slightly, the pressure on the mantle and therefore if anything reduce volcanic activity not increase it. As there are many active volcanoes (mostly found at plate boundaries) both at the poles and the equator then the evidence for 'centrifugal eruption' would appear tenuous at best. Sciences improving understanding of how volcanoes work is leading to the ability to provide warnings of when a volcano will erupt that has and will continue to save lives.
The size of a volcano is determined by the type/amount of lava feeding it (and hence also eruption style) and the strength of the local gravitational field. The size of the landmass it is based on is irrelevant. Hawaii for example is the highest mountain on Earth (if you measure from base to top rather than from sea level), and it is the landmass it is based on. It is also created by magma swelling up or ‘hotspot’ beneath the crust rather than fault activity at a plate boundary.
Originally posted by googlefudgeMy understanding is that centrifugal forces have bugger all to do with it. If centrifugal forces were so great as to be able to bend rocks then humans would fly off into orbit all the time! Volcanoes merely represent a means of balancing the pressure from within the planet.
It is possible for an object to experience centrifugal force, and therefore it can be said to be as much in existence as any other force. (While it is true that it is a common mistake to claim that a centripetal force is a centrifugal one, it does not mean that the centrifugal force does not exist).
Volcanoes, like everything else on Earth are pulled do ...[text shortened]... gma swelling up or ‘hotspot’ beneath the crust rather than fault activity at a plate boundary.
Originally posted by googlefudgeThere is no force that pushes objects away from the centre of their rotation.
It is possible for an object to experience centrifugal force, and therefore it can be said to be as much in existence as any other force. (While it is true that it is a common mistake to claim that a centripetal force is a centrifugal one, it does not mean that the centrifugal force does not exist).
Volcanoes, like everything else on Earth are pulled do ...[text shortened]... gma swelling up or ‘hotspot’ beneath the crust rather than fault activity at a plate boundary.
Originally posted by scottishinnzWhat about Inflation? How does that work?
My understanding is that centrifugal forces have bugger all to do with it. If centrifugal forces were so great as to be able to bend rocks then humans would fly off into orbit all the time! Volcanoes merely represent a means of balancing the pressure from within the planet.
oops maybe I meant that for Xanthos lol
Originally posted by ChurlantHere is an interesting article on the subject:
You can prove some negatives - not all of them. We return to faith again.
Yes, I'm saying the Bible is not literal truth.
-JC
http://www.worldviewweekend.com/secure/cwnetwork/article.php?&ArticleID=813
Noah’s Ark?
For Real
By Brannon S. Howse
- Joined
- 31 May 06
- Moves
- 1795
Originally posted by XanthosNZSo why haven't you landed up in the centre of the earth?
There is no force that pushes objects away from the centre of their rotation.
centrifugal and centripetal forces are just comments on the direction of the force and say nothing about what is causing that force. while you are pulled down by gravity (centripetal) the ground pushes up (centrifugal) otherwise everything would colaps in to the centre of the earth. It is of course ridiculus to think of volcanos in terms of centrifugal or centripetal forces, that was kinda my point. it's just not true to say that centrifugal forces don't exist.
- Joined
- 31 May 06
- Moves
- 1795
Originally posted by frogstompLots of hypotheses. one might be right, or not. lots of people working on it, big particle acelerators and stuff. live long enough and maybe someone will have an answer for you.
What about Inflation? How does that work?
oops maybe I meant that for Xanthos lol