Thermal vesiculation during volcanic eruptions.Terrestrial volcanic eruptions are the consequence of magmas ascending to the surface of the Earth.  The development of vesicularity in magmas has until now been viewed (both thermodynamically and kinetically) in terms of the pressure dependence of the solubility of water in the magma, and its role in driving gas saturation, exsolution and expansion during decompression.  We conclude that the thermal path experienced by magma during ascent strongly controls degassing, vesiculation, magma strength and the effusive-explosive transition in volcanic eruptions.
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