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ons, laboratory experiments, and geophysical data. Decompression Melting Theory One of the central theories addressing why do volcanoes erupt learn about the theory and decompression melting reveals how a decrease in pressure in

effectively and leading to explosive eruptions. Conversely, basaltic magmas have lower silica levels, are more fluid, and tend to produce effusive eruptions where lava steadily flows out. Gas content, prima