Lava Lake in Pu'u O'o Crater: July 2007 - Overturning of Older Crust is a Common Feature at Lava Lakes. When the Crust Cools Sufficiently, it ...

Overturning of older crust is a common feature at lava lakes. When the crust cools sufficiently, it contracts and becomes denser than the liquid underneath. Eventually, pieces of it become unstable and overturn to sink back into the lake. New crust is formed by upwelling lava from underneath. hawaii_e6829.jpg (Photo: Tom Pfeiffer)

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