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Lava Flows. The major eruptive product of Hawaiian volcanoes is lava. Lava flows can form during fountaining eruptions or they can well out of the ground with little or no pyroclastic activity. There are two major types of basaltic lava flow, ' a'a and pahoehoe.ava flows can form during fountaining eruptions or they can well out of the ground with little or no pyroclastic activity.
Much of Mount Rainier is composed of andesite lava flows. Lava flows may accompany explosive eruptive activity, but they occur more often after explosive activity declines.The term andesite refers to the chemical composition of the rock.he only lava flows known to have been erupted from Mount Rainier in the past 10,000 years are those that built the summit cone, which was constructed within the past 5,600 years.