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Volcano Term Definitions
The vertical difference between the summit of a mountain and the adjacent valley or plain.
The interval of time between volcanic eruptions.
The oceanic ridges formed where tectonic plates are separating and a new crust is being created; also, their on-land counterparts such as the East African Rift.
A zone of volcanic features associated with underlying dikes. The location of the rift is marked by cracks, faults, and vents.
The regions of mountain-building earthquakes and volcanoes which surround the Pacific Ocean.