Gas trapped in magma under high can cause explosive eruption.?
448232
Depends on the composition of the magma.\n\nMagma high in silica tends to be thick & gas bubbles are trapped. The gas builds up & boom! Explosion.\n\nBasaltic lava tends to be "soupy" so that the gas bubbles escape. No explosions here.\n\n:)
867639
See for yourself:\n\nhttp://www.solcomhouse.com/volcano.htm\nhttp://volcano.und.edu/vwdocs/frequent_questions/group10_new.html\nhttp://www.exn.ca/volcanoes/causes.cfm\nhttp://vulcan.wr.usgs.gov/Outreach/AboutVolcanoes/where_do_volcanoes_occur.html\nhttp://library.thinkquest.org/10136/volcano/volctq.htm\nhttp://en.wikipedia.org/wiki/Volcano\n\nMore random links I keep at hand for God knows what uses.
622081
Well, that would be some drilling job. How do you propose to get around all that magma exploding upwards once you puncture the containment of the crust you just drilled through? I suspect you will be creating a nasty little, maybe growing into a large volcano. And somewhere along the line, instead of drilling DOWN into the Earth, won't you be drilling ... UP??
170224
Volcanoes occur because of cracks or gaps in the Earths crust.Heat rises ,so the hot molten rock comes through the gaps and builds up.WHen the lava builds up enough to come through the last bit of crust the emense pressure makes a volocano.Explode!
998878
Both are held under pressure. The molten rock (lava) is full of gases like a fizzy drink and when the pressure is released the gases escape causing an explosive reaction.  IE. the volcano erupts and the drink fizzes up when the gas is released at normal atmospheric pressure.
523806
viscous felsic or high silica magmas
1049359
There are explosions in and on the surface of the sun, but as for volcanoes like here on earth no there are none. Since the surface of the sun is molten (which means not solid) there are no mountains on the sun.
286236
A huge eruption, in common terms, can mean an explosive volcano.  And that is caused when magma that is about to exit at the opening begins to cool down and causes the hole to close/block (not leaving enough space for the magma to flow).  This causes hot gas to be trapped until it builds up so much that it explodes.  Such volcanoes include ashes, "volcano bombs", dust, cinder, etc etc\n\nHowever, any type of eruption (be it explosive or just a quiet flow) is caused by movement in the plates. Plates are the result of "continental drift".  When one plate goes under another plate, the plate becomes extremely hot and liquifies.  This "liquid" then builds up, and because it is in excess... it finds a hole though which it can flow.  So the amount is determined by the magnitude of the earthquake and how much of the plate has melted.
771844
A\n\nVolcanic explosions such as St. Helen's are cause by super heat gases.  Often Steam.
341557
If you meant,  "How are a soft drink and magma  alike?" it goes like this.  In magma there are a lot of compressed gasses of  various  kinds, including carbon dioxide, the compressed gas in soft drinks.  When the magma is very deep in the earth, the gasses are powerfully compressed and the bubbles remain very small. But  as the magma rises to the surface of the earth, the pressure decreases and the  bubbles become larger.  This is something  like popping the top on a can of warm soda after shaking it up real hard.  The soda kind of explodes from the expanding carbon dioxide bubbles getting very large, very fast.  The same  thing happens with the compressed gasses in erupting magma.  They  help cause the magma to explode up into the air.  Other compressed gasses in magma include hydrogen sulfide and sulfer dioxide.
271093
Yes it can, and it is usually due to volcanic events under the water.
425045
The answer is: D. Volcanoes that have large amounts of silica\n\nHere is the reason why it is D:\n\nMagma that contains high amounts of silica is very viscous. That means it is very thick. Because of its thickness, gases can not escape & will build up behind the magma. When the pressure builds up enough, an explosion occurs. Large chunks of lava rock are thrown from the volcano in all directions. The debris fallout from these types of eruptions is extremely dangerous!\n\nIn 1980, Mt. St. Helens was an explosive composite volcano. Half the mountain was gone in a matter of minutes. The problem with that particular volcano was not the falling rock debris (few people). In fact w/ St. Helens, it was the ash which is small particles of volcanic glass (a.k.a. silica). These minute particles of glass can cut your lungs. Also, people living & camping down below the mountain were caught up in mudflows caused by the melted snowcaps. Also, pyroclastic flows can race down the mountainside at tremendous speeds. Anyone caught in the way would be annihilated.\n\nSea water can cause explosive steam eruptions but this occurs in submarine volcanoes (underwater). No one is around to be in its way.\n\n:)
573358
many things can happen when a volcano erupt. it depends on the kind of eruption of volcano.\n\nMagma contains dissolved toxic gases (sulfur dioxide, carbon dioxide, etc...) that are released into the atmosphere during eruptions. Volcanic gases affect people, animals and agriculture: SO2 irritates skin and the tissues and mucous membranes of the eyes, nose, and throat... sometimes CO2 may become concentrated at levels lethal to people and animals.\n\nEruptions may trigger lahars (a hot or cold mixture of water and rock fragments flowing down the slopes of a volcano) directly by quickly melting snow and ice on a volcano or ejecting water from a crater lake.\n\nIn volcanoes with massive cones landslides may be generated.\n\nVolcanoes erupt lava and everything in the path of an advancing lava flow will be knocked over, surrounded, or buried by lava, or ignited by the extremely hot temperature of lava.\n\nWhen a volcano make an explosive eruption, pyroclastic flows can be generated. Pyroclastic flows are high-density mixtures of hot, dry rock fragments and hot gases that move away from the vent that erupted them at high speeds.
450623
go to\nhttp://en.wikipedia.org/wiki/Volcanoe
840305
The plate which is being subducted under the other plate carries down volatiles with it (carbon dioxide, water etc from in the clay and sediments and rocks and stuff) - and these volatiles allow melting to occur in the mantle at a lower temperature than it would ordinarily do. Some of this melt (magma) may then rise up through the overlying crust (so on the overriding plate, not the one which is being pushed under) and erupt out at the surface as lava... so forming volcanoes.
579528
famous 1902 volcanic eruption, most of the damage i seem to remeber being caused by a pyroclastic flow, killed about 27,000 people. I'm not sure if that is a myth or not!
833629
1.  Being near active volcanos probably means you're also in an area that is subject to earthquakes, for the same reason (plate tectonics).\n\n2.  If they erupt, they can do so explosively, in which case hot ash and smoke can suffocate you and burn you to death.  Or they can erupt slowly, like the ones on Hawaii typically due, in which case the lava can overrun homes, properties, etc.\n\n3. Volcanic ash that settles out of the atmosphere can damage respiratory health.\n\n4.  The lava and hot ash can rapidly melt any snow or ice that may be on the mountain, causing devastating floods and mud flows (lahars).\n\n5.  Volcanic dust can be hazardous to airplanes.\n\n6.  If the eruption is big enough, the ash can cause temporary cooling of the earth's climate by blocking sunlight.