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ACTIVITY 4: Volcanic Eruptions and its Magma Content Directions: Given the characteristics of magma, identify the type of volcanic eruption. Write your answer in the space provided. Types of Volcanic Eruptions Characteristics of Magma This eruption is characterized by sustained explosions of solidified or highly viscous andesite or rhyolite 1. magma from the vent. It results when magma encounters shallow groundwater, flashing the groundwater to steam, which is explosively ejected along with pre- exiting fragments of rock. 2. This eruption has low viscosity basaltic magma. 3. This eruption is characterized by distinct blasts of basaltic to andesitic magma from the vent. 4. 5. This eruption is produced when magma comes in contact with shallow groundwater causing the groundwater to flash to steam and be ejected along with pre-existing fragments of the rock and tephra from the magma. This eruption results from the collapse of an andesitic or rhyolitic lava dome, with or without a directed blast, to produce glowing avalanches or nuée ardentes, as a type of pyroclastic flow known as a block- and-ash flow. 6. This eruption results from a sustained ejection of andesitic to rhyolitic magma into eruption columns that may extend up to 45 km above the vent. 7
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