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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.
When a volcano erupts, it spews out molten rock, which is called lava. It is liquid in form and is extremely hot. The force of the blast and the viscosity of the liquid causes lava to flow away from the volcano.The composition of lava affects the way it flows, the speed at which it flows, and the resulting rocks that develop when the lava cools.t is liquid in form and is extremely hot. The force of the blast and the viscosity of the liquid causes lava to flow away from the volcano. The composition of lava affects the way it flows, the speed at which it flows, and the resulting rocks that develop when the lava cools.