Lava bubble bursts are a relatively mild form of explosion that
occurs when a lava tube at, or below sea level, fractures abruptly,
allowing seawater to enter the tube system. As the infiltrating
seawater comes into contact with molten lava in the tube, the
water is heated to steam in an instant. This results in sporadic
bursts of molten, dome-shaped lava sheets that expand rapidly as
steam is released at the surface.
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