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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.
Two large eruptions took place, first about 2,300 years ago and another 1,000 years ago. About 90 percent of Mount Rainierâs eruptions have been in the form of lava flows, which is unusual for a composite cone (Harris et al., 1995).In contrast, most of the other Cascade volcanoes, including Mount St. Helens, have had a more violent history with few lava flows and a high volume of pyroclastics.wo large eruptions took place, first about 2,300 years ago and another 1,000 years ago. About 90 percent of Mount Rainierâs eruptions have been in the form of lava flows, which is unusual for a composite cone (Harris et al., 1995).