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Some volcanoes erupt fairly frequently, others may be dormant for hundreds or thousands of years. The pattern of eruptions, if any, depends on the specific volcano.
It depends on the volcano. Each is different and has a different type of eruption pattern. Mt. Vesuvius in 79 AD erupted with a pyroclastic cloud and the eruption had begun 3 days earlier. Yet, in 1944 it erupted with a slow moving lava flow. So, even the same volcano can have a different type of eruption.

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7y ago

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