Composite volcanoes can have a long dormant period in which people can forget that they were ever once active volcanoes.

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Composite volcanoes, also known as stratovolcanoes, can have periods of dormancy lasting centuries or even millennia, during which time erosion and weathering can make them look like ordinary mountains rather than the explosive volcanoes they once were. People may forget that they are still potentially active volcanoes.

Composite Volcanoes Can Have a Long Dormant Period in Which