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The camera is about 7 meters above the lava flow
surface in this picture. The rock is called “pillow lava” -- you
can see why. It is created in slow-moving lava flows. The surface of the
lava cools quickly forming a skin around the hot lava inside. Continued
pressure of the lava flowing inside causes the pillow to stretch and expand.
A new pillow forms when hot lava bursts through the chilled skin of a previous
pillow.
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