Explosive eruptions tend to build up

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Explosive eruptions are typically associated with composite volcanoes, which are tall and steep-sided with layers of ash, lava, and pyroclastic debris. Shield-shaped volcanoes are the result of effusive eruptions with low viscosity lava flows, while plateau basalts are formed from widespread lava flows that cover a large geographic area. Many subsequent lava flows are also the result of effusive eruptions, while wide, flat platforms in the sea are known as oceanic plateaus and are formed from volcanic activity at mid-ocean ridges.

Explosive Eruptions Tend to Build Up