I have the idea that its so hot that it can melt anything so what materia/minerall/force is it that keeps it locked below the surface, save volcano's, all the time?
2006-08-27 15:11:19 · 16 answers · asked by The Angry Stick Man 6 in Science & Mathematics ➔ Earth Sciences & Geology
Interesting question.
I imagine, that the interface with the Earth's crust has a temperature gradient (changing value) where the magma gradually blends into solid rock. It reaches the surface when pressure shift or easy paths allow it to escape without cooling to a solid.
Aloha
2006-08-27 15:18:54 · answer #1 · answered by Anonymous · 2⤊ 0⤋
The magma is actually very hot when it is in the mantle. The core is in the middle the core is surrounded by mantle and on top of the mantle is the crust which is land. There is a large space between the mantle and the crust so when the magma in the mantle rises up to the crust they start cooling down and solidify before they can ooze out of openings in the crust. When there is enough pressure, the magma will be forced out faster than they cool SO that's how volcanos erupt... ( should be )
Magma is lava. You refer it to as lava when it is above the crust.
Hope this information is conducive.
2006-08-28 09:15:28 · answer #2 · answered by Anonymous · 0⤊ 0⤋
The surrounding rocks are also a great insulator which slows down the melting.
You must understand that if something is melting something else, the overall heat of the system is reducing so that there is a limit as to how much rock can be melted to create more magma without adding more heat to the system.
2006-08-27 23:09:57 · answer #3 · answered by idiot detector 6 · 0⤊ 0⤋
Well, there's a point where the heat of the magma is lower and turns to stone. That's probably where the magma is touching the edges inside the volcano.
As the pressure builds from more magma, it gets hotter, and the top may crack in a huge KABOOM that will spew rock, ash and lava everywhere.
2006-08-27 22:18:24 · answer #4 · answered by Anonymous · 1⤊ 0⤋
I didnt think magma was limited to hot combinations of bio-masses. I think magma is changing all the time while in its natural environment when it has nothing altering its natural proggressions,the earths core may be quickly consuming it as is needed to keep the earths crust healthy, as in fewer deserts, more trees and plants.
I personally think that it endangers the earths crust to build reservoir- storage tank containers to hold ground water ,that are not natural porous rock, because of this. I wonder if septic tanks arent sapping important bio-returns to the crust as well.
2006-08-27 22:21:42 · answer #5 · answered by D Suzi Maystrom 2 · 0⤊ 0⤋
Convection I think...
The Magma rises because hot magma is less dense, and as it rises, it cools, causing it to become denser, cauisng it to descend again in a pattern.
I learned that in 6th grade...
2006-08-27 22:18:00 · answer #6 · answered by Anonymous · 0⤊ 0⤋
Rock and dirt is a good insulator. If we lived atop a crust made of copper we'd be in trouble.
2006-08-27 22:17:14 · answer #7 · answered by da_hammerhead 6 · 1⤊ 0⤋
There is a layer of magma-repelling cheese... it only escapes when mice eat through the cheese...
2006-08-27 22:17:38 · answer #8 · answered by nikkoj1975 4 · 1⤊ 0⤋
gravity, but once gases build inside that's what draws the magma to the top to erupt. don't you watch any of those discovery shows?
2006-08-27 22:17:10 · answer #9 · answered by wilderone74 4 · 1⤊ 0⤋
how about a quick ans.? too much gravity not enough pressure to oppose it. ( presume magma has some weight to it.)
2006-08-27 22:18:14 · answer #10 · answered by Raptor 3 · 0⤊ 0⤋