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Mt. Rainier has granitic and basaltic lava types. It is a stratovolcano or composite volcano. The volcano has 26 major glaciers and 36 snowfields on it. Also, it has a glacier â¦ cave network, the world's largest, made from the heat from two volcanic craters.A relatively small crater lake sit on Mt. Rainier.t. Rainier is part of the Cascade Volcanic Arc, which extends from Northern California north into Canada. These types of volcanoes are most known for their explosive eruption types.
Relative to Mount St. Helens, Rainier is an older and taller mountain (and has more glacial volume and mass than St. Helens did even prior to its 1980 eruption), and many more people live within range of Rainier and the rivers that flow from its glaciers (susceptible to lahars and pyroclastic flows) than St. Helens.