EOSC 114 Chapter Notes - Chapter 9: Peridotite, Andesite, Dacite
27 Aug 2017
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A it is more predictable and we can get away from the lava. B more hazardous the way of them (wind moves them fast). We don"t understand when they happen and why. We also don"t know where the products (ash clouds) would go, you can"t get out of. The soil on lands near volcanoes is very fertile. Igneous rocks rocks formed by crystallizing from magma. The magma is molten rock (lies below the surface), if it hits the surface it cools very quickly and crystallize volcanic igneous rock. If it doesn"t hit the surface, then it crystallizes slowly and becomes igneous intrusion (intrusive igneous rock). When magma gets to the surface, it could be lava, or if it erupts explosively pyroclastic material (hot rock). The source region of magma is the mantle. Mantle made of rock, dominantly peridotite (high density) The partial melting of the mantle changes the composition of it. The dikes indicate the movement and changes of magma.
