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wow i somehow just assumed all magma was the same substance, when if i'd thought for two seconds id have realized there's different types of magma depending on what types of rocky compositions are melted, and that different magmas have different behaviors/properties
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Most volcanism on earth isn't caused by heat being added to rocks, it's water being added to already-fairly-hot rocks, and the water lowers their melting point
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Oxygen is the most abundant element in the universe after Hydrogen, helium and carbon. With hydrogen FAR more abundant than carbon, there will be more water than CO2, and carbon does not vaporize until nearly 5000 Kelvin. Mantle is 3700 K.