(magma) geology  about magma?
86934
rephrase your question
731840
The answer to this question is so incredibly basic (no pun intended...) that you really shouldn't be bothering with any course in geology if that's what you're taking... and if you're in school my suggestion would be that you drop out, cause from the string of questions you just asked, you're clearly way to lazy to get anywhere anyway. Sorry. In short, do your own freakin homework! Look at your homework, try it yourself, and if there are parts you don't understand, I'd be more than happy to help. But just typing out your homework questions word for word and expecting someone else to do all the work for you? Get a life.\n\nWhen you do start actually thinking, I am able to tell you why the hawaiin volcanoes look like they do, the properties of the magma produced and what is believed to cause volcanism at that location...
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.
1012443
Igneous.  Not sedimentery because those are made up of worn down other rocks, and not metamorphic because they are rocks that were originially another sort of rock.
751689
The crust and mantle are generally solid.  The inner and outer core are molten rock and metal...very dense, but still liquid.
149283
Volcanology (also spelled vulcanology) is the study of volcanos, lava, magma and related geological phenomena. A volcanologist (also spelled vulcanologist) is a person who studies in this field.\n\nVolcanologists frequently visit volcanoes, especially active ones, to observe volcanic eruptions, collect eruptive products including tephra, rock and lava samples. One major focus of enquiry is the prediction of eruptions; there is currently no accurate way to do this,but predicting eruptions,like predicting earthquakes,could save a lot of lives. You would have to be knowledgeable in chemistery in order to become a volcanologist.
810078
volcanic crater - a bowl-shaped opening at the top of a volcano, its that opening from which lava, gases, and ejecta ..\n\nfrom the wikipedia : Perhaps the most conspicuous part of a volcano is the crater, a basin of a roughly circular form within which occurs a vent (or vents) from which magma erupts as gases, lava, and ejecta. A crater can be of large dimensions, and sometimes of vast depth. Very large features of this sort are termed calderas. Some volcanoes consist of a crater alone, with scarcely any mountain at all; but in the majority of cases the crater is situated on top of a mountain (the volcano), which can tower to an enormous height. Volcanoes that terminate in a principal crater are usually of a conical form.\n\nOn Earth, volcanic explosion craters are often formed when magma rises through water-saturated rocks and causes a phreatic, or steam explosion. Volcanic explosion craters from phreatic eruption often occur on plains away from other obvious volcanoes. Other volcanic eruptions can cause mild explosions, often in a series of events. Some volcanic craters form by collapse with little or no explosive activity. Volcanic craters are typically seen either on the summits or on the flanks of volcanoes. Volcanic craters have also been identified on the Moon, Mars, Venus, and Io.
341583
They're igneous (made by cooling magma), metamorphic (heat/pressure/chemical change), or sedimentary/stratified (compressed layers).
865517
Tectonics, (from the Greek for "builder", tekton), is a field of study within geology concerned generally with the structures within the crust of the Earth (or other planets) and particularly with the forces and movements that have operated in a region to create these structures.
163346
I got an idea\n\nHow about one magma chamber passing another on its way to the surface. The one magma chamber says to the other "Are you on your way to the top?". The other magma chamber replies "Yeah, I don't mean to intrude".\n\nI got another one. One continent is approaching another continent on a tectonic plate. The one continent says "you're very subductive" and the other continent says, "I don't know, I think we should just have a plutonic relationship"\n\nIt's funny?\n\nOne more. Two magma chambers are sittin' havin' a chat. One magma chamber says to the other "did you see that young intrusive that came up the other day, boy was she hot!". The other magma chamber says "Don't get your hopes up, she's a dyke."\n\nHave I gone too far? No?\n\nOkay I have one last one. I promise\n\nTwo sulphide crystals are floatin' around in a magma chamber. One of them says to the other "look at the cleavage on that sweet little feldpar over there." The other suphide crystal says "pff, silicon."\n\nThank you everyone and g'night.
502206
Contact - magma is injected into preexisting rock & the heat from the magma metamorphoses the rock.\n\nRegional - covers a large area; usually due to mountain forming episodes called orogenies; the mountain forming episodes are caused by two continental plates converging; neither plate subducts b/c they are both the same in density.\n\nCataclastic - occurs along faults where plates grind past each other; due to friction\n\nThere is also burial metamorphism which occurs due to great heat & pressure from burial under many layers of sediment; when heat & pressure becomes great enough, burial metamorphism becomes regional.
765041
The two properties of the magma that determine the kind of volcano are:\n\n1)Viscosity\n2)Composition\n\nThe viscosity of the magma is a function of the temperature, the degree of crystallization, degree of polymerization and the composition of the melt.\n\nThe composition of the melt is related to the amount of silica it contains and the amount of volatiles dissolved.\n\n\nThis two property are usually coupled (they act together).\nSilica rich magmas are usually colder that mafic ones, contain more volatiles, and hence they have a higher viscosity compared to mafic magmas, so they form strato volcanoes as opposed to shield volcanoes.
759449
Plates are solid pieces of the Earth's crust that float and move around on top of the liquid interior of the earth.  Anyway when two plates are pushing against each other, pressure builds up until they move suddenly and you get an earthquake.  Volcano's form because the friction created when two plates rub against each other can be hot enough to melt rock.  And when that molten rock rises to the surface on plate boundaries, you get volcanos.
788400
quartz. This is not all that magma contains though, It can also have feldspar, garnet, and many other minerals. Quartz is the most common though.
247852
The other answerer has a point. However, a little thought will get you the answer. \n\nD. Sialic or Mafic? These terms describe composition. What could that have to do with grain size?\nC. % Ferromagnesian minerals? Again, composition has nothing to do with grain size. \nD. % Quartz? Same reason again. \nA. magma or lava? Okay, do you know the definitions of these? Magma is BENEATH the earth surface, lava is erupted onto the surface. Which one cools faster? It will have the SMALLEST crystals. The slow cooling rock will have time for LARGE crystals to grow.
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ok. i am giving u links which will help u find the right information fast and efficiently. since you have to write in ur words, its better that u deduce the answers urself. it should be quite simple and it will help you.\n\nbasically granite is an igneous rock which is formed due to the cooling down and crystallization of molten magma. here are the links which will help u. there is a file included which is quite informative.\n\nMost of the sites have overlapping information, so use the info u need. Have fun and do cite the links as the sources
1156287
it's the core of the earth. lava. melted rock.etc