General Discussion Undecided where to post - do it here. |
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#3 |
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Now this was more clever/subtle than other attempts.
Well done. But you shouldn't have bolded it in the thread. It takes away from it. But it does need an actual discussion to pass muster. ![]() And as long as we don't get 20 similarly named treads..... I really don't care. Repetition doesn't quite show the same creativity. |
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#6 |
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Originally posted by rah
Maybe. ![]() A touch busy today though. But if I do I won't bold it in the thread. And your last one was so bad, I just deleted it. There has to be a legitimate topic (or at least an appearance of one) to discuss. Yes I know, but I figured you most assuredly needed something to do. ![]() Zkrib ![]() |
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#7 |
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#8 |
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#9 |
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#11 |
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Hawaiian volcanoes erupt basaltic lava from deep within the earth. This type of lava is relatively fluid and not full of gas so it flows out of the volcano easily.
Continental volcanoes, like those along the Rockies and Andes erupt lava which is basically remelted crust and is sticky and full of gas - so it erupts violently throwing debris high into the air, blotting out the sun and covering everything in a gritty mess. So there you have it - it's all down to the body chemistry of the volcano. ![]() |
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#13 |
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Originally posted by PLATO
Okay...now I am confused. I thought lava was magma that came up through a crack in the Earth's mantle. Why the different types? Erm, what do you think magma is made out of? Molten rock, which is basically either a mineral/metal substance or silicon (sandstone etc.) possibly bonded to oxygen. IIUC, "Crust" magma is lighter rocks and very messy, while magma from further down is likely to be have a more consistent texture and not be full of carbon (ash is carbon, right?). |
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#14 |
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Originally posted by snoopy369
Erm, what do you think magma is made out of? Molten rock, which is basically either a mineral/metal substance or silicon (sandstone etc.) possibly bonded to oxygen. Yes, I know it is molten rock. I guess I had assumed that it was all similar stuff and had never thought to differentiate it. |
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#15 |
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Originally posted by CerberusIV
So there you have it - it's all down to the body chemistry of the volcano. ![]() Generally speaking the more 'landward', or established a volcano, the more silica it contains, the more viscous it is, the steeper the gradient of the volcano and the more dangerous it is to humans... |
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#16 |
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Originally posted by Zkribbler
There a essentially two kinds of volcanos: shield volcanoes and cone volcanos. Hawaii has shield volcanos, where the lava comes out really hot, really fluid, and thus spreads out in a wide dome. Tahiti has cone volcanos where the lava is less hot, thicker and thus piles up into the classic volcano cone. Because Hawaiian volcanos are more fluid, they are less explosive and thus throw up less ash. Er...ya get it? what about composite volcanoes?! don't tell me 4th grade was a lie!!!! |
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#17 |
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