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2014-11-11T19:52:41+08:00
It Because to be learn about the shape of the volcanoes such as  Triangle  The shape of volcano.
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2014-11-14T20:20:09+08:00

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We study the shapes of the volcanoes to know how the magma (viscous or not) flows in different conditions when the volcano releases it. (Because there are different cone shapes)...

(Not sure about the answer though. This is just self-explanation)

--Mizu
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