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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.
Activity. The Mount Rainier Volcano is what is known as a giant stratovolcano and though it looks quiet it is still considered an active volcano. The last eruption from Mount Rainier took place in 1894 and it has been determined that the volcano has erupted at least a dozen times in 2,600 years.acoma is a bit closer at only 65 miles and several smaller towns are even closer. Though the volcano is not considered very active at the moment other eruptions in other areas in the world are giving scientists clues about what to expect from Mount Rainier.