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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.
The terminology of pyroclastic flows and pyroclastic flow deposits can be complex and confusing. In general, there are two end-member types of flows: 1  NUEE NUÃ©E -- ardentes these contain dense lava fragments derived from the collapse of a growing lava dome or dome, flow.  and NUEE NUÃ©E -- ardentes these contain dense lava fragments derived from the collapse of a growing lava dome or dome, flow. 2  AND PUMICE -- flows these contain, vesiculated-low density pumice derived from the collapse of an eruption.  column