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1.Extrusive Vulcanicity (volcanic):
In which materials intrude crustal rocks and don’t reach the earth’s surface. Magma is the molten material while it’s underground.
2.Intrusive Vulcanicity (plutonic)
In which materials reach the earth’s surface. Lava is the molten material after it reaches the surface.
There are two types of lava and magma, acidic and basic. Acidic lava is viscous and solidifies quickly and doesn’t spread far but accumulates around the vent. Basic lava is more fluid or less viscous and takes longer before cooling and spreads for great distances before doing so. Other materials emitted are gases, ashes, dust and cinder. The solid materials are called pyroclasts. Materials come out through a hole/vent (vent eruption) or crack/fissure (fissure eruption).
marto answered the question on March 25, 2019 at 05:55
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