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IGNEOUS ROCK, single volcano may extrude lavas , exhibiting very…
IGNEOUS ROCK
Origin of Magma
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Role of pressure
Increase confining pressures, increase in a rock's melting temperature the reducing the pressure lowers the melting point
Confining pressures drop, decom-pression melting occurs
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How it formed
Magma < dense than the surrounding solid rocks, it rises toward the surface
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Evolution of magmas
Bowen's reaction series
a magma cool, minerals crystallize in a systematic fashion based on their melting point
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single volcano may extrude lavas , exhibiting very compositions
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