Ever noticed that some volcanoes, like Mauna Loa in Hawaii, are reasonably well-behaved, while others, like Mt. St. Helens are dangerously explosive?

The difference lies in the type of lava involved. Oceanic volcanoes produce lava that flows more easily and doesn´t build up as much pressure inside the volcano. Continental volcanoes, on the other hand, produce a thicker, more viscous magma that flows poorly, and tends to build up pressure inside the volcano and could blow its top.

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