When lava ponds up in a passage it cools to form a smooth-surfaced lake. Typically the ponding occurs in plunge pool basins eroded beneath lava falls, but may also occur when flows have been backed up by constrictions downstream of the flow due to passage collapse. Evidence suggests these lakes may be as much as 90 feet deep ufrom the top of a falls.

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	Created: August 4, 2000 Author: Dave Bunnell