a. A  large opening is proclused. b. The top of volcano collapses down. c. Magma forced upward earth's surface
446778
1 (People see the volcano with some smoke over it)\n2 (they do not believe their eyes, "Wow, let's come a bit closer and watch the fire"  - they say)\n3 (The top of volcano collapses down)\n4 (A large opening is proclused)\n5 (Magma forced upward earth's surface)\n6 (Poor people, they were too curious)
924357
volcanoes are built when tectonic plates push together, the way mountains are formed. except volcanoes have magma inside of them. the gas and magma inside are under extreme pressure, and this pressure pushes its way through small cracks in the rock, eventually escaping in an eruption of gas that brings lava with it. a lot of people have been killed by eruptions, but i cant tell you how many. the lava takes weeks or months to cool down unless it hit the water, which will cool it in a matter of days.
28068
Eventually it would collapse into a sphere because of gravity, the elements (rain, etc), and techtonic action such as earthquakes.
872770
vent-is an opening in which gasses especially air can pass.\nmagma chamber-is where the magma kept and because of the heat and pressure,magma is pushed upward ,magma that is outside,is called the lava.\ncrater-the big hole where lava came out\n\ni think thats all i can give\n\ngood luck
834976
My guess is dissipation, hydrothermal, volcanic. Just guessing.
498121
1. epicenter\n2. fault\n3.lava\n4.pumice\n5.rope
171052
according to my source it is a volcanic remnant being... um, harvested (for lack of a better word) for lava rock.  Just a note, most active or recently (in geological history, not ours) active volcanos can be told by thier names, generally being called Mount ______, instead of ________ Mountain.  try it :)
210837
Tectonic movements (earthquakes), volcanic action, and erosion.  \n\n1. Tectonic movements -- As the various plates that make up the Earth's surface move around, some crash into each other and one is forced up over the other.  Thus, for example, Himalayas.  The rocks that were deep underground are forced up near the surface.\n\n2. Volcanoes spew out lava which forms igneous rocks, but certain kinds of explosions will toss out large chunks of metamorphic rock from deep underground as well.\n\n3.  Erosion is primarily responsible for most of what we see as the surface of the Earth. While the other two actions will bring the rock near the surface, the action of wind and water removes the top layers of dirt and lighter rock.  Most significant is the action of glaciers, which strip everything down to the bare rock -- this is, I believe, why you find granite near the surface in New Hampshire.
914838
I'm not an expert, but just rationally thinking about this would be similar to a pot of boiling water. If something is on top of the convection wave, it is moved away from the centre of the convection current (the hottest part).\n\nLikewise, as the the convection wave moves up and outward and back down to the point of origin, the earth's plates "float" with this motion and because the plates are solid, they have to go someplace when and where they impact. The plate that contains the heavier, or more mass, subducts under the "lighter" plate.\n\nOccasionally, the thin part of a plate will slide over a "hot spot" where the magma "boils" through the plate and forms a volcano - and the rest - - -
435645
A, because it's the division between two tectonic plates. the plates move apart and magma from inside the earth comes up and piles up in the form of mountains.
603115
volcanos\ntectonic plates movements
616929
1) when the plates collide - eg himalayas\n2) when the plates pull apart - eg mid oceanic ridge, it is underwater but still a mountain chain\n3) when one subsides under another, when that plate melts, it can cause a chain of volcanoes, which can also make mountains - pacific rim
384694
the activity, located between the aleutian islands and southern japan, is importent in huge ways. you know how the earth contains a lot of pressure? well, the ring of fire acts as a waste basket because the earth gets rid of the pressure by using the volcanos. another importent thing is the magma. the magma, combined with water, metals, rock and heat, are used to create islands.
79926
Careful: The questioner is correctly stating that magma is inside the earth's crust (or lithosphere).  Lava is magma that has erupted.  Magma rises up from within the lithosphere because it is more bouyant (wants to float) that the dense rock around it.  Lava is different, once it's on the surface, it does tend to flow with gravity, like water.
950107
Ah... something called a caldera forms.\n\nhttp://vulcan.wr.usgs.gov/Glossary/Caldera/description_caldera.html\nhttp://en.wikipedia.org/wiki/Caldera\nhttp://www.agu.org/pubs/crossref/2003/2003GL018380.shtml\nhttp://hvo.wr.usgs.gov/volcanowatch/1996/96_04_26.html\nhttp://www.yellowstonenationalpark.com/calderas.htm\nhttp://www.mvo.ms/glossary.htm\n\nGosh, if these don't help... I don't know what will.
305725
Yes, the seismic activity that causes one can also cause the other.  When the Earth's techtonic plates shift but experience some resistance, they shake, jump, rattle the area around that resistance.  Sometimes a crack in the Earth's crust is created or widened which creates the eventual environment for a volcano.  Othertimes volcanoes are created over a hot spot (thin crust) in the Earth's crust, like the Hawaiian islands.  This is somewhat different, although some tremors can be felt.
695274
It erupts from he center point of the ridge from underneath the crust of the Earth. The center is the oldest point, seeing as how the material flows away from the peak of the ridge. It's like Earth's pressure valve, Hawaii was formed a bit like this.