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**GreefeWrereon** · 08-02-2007, 11:48 PM

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?).

08-02-2007, 11:48 PM	#13
GreefeWrereon Join Date Oct 2005 Posts 389 Senior Member	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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