Lava balloon
A lava balloon is a gas-filled bubble of lava that floats on the sea surface. It can be up to several metres in size.
A lava balloon is a gas-filled bubble of lava that floats on the sea surface. It can be up to several metres in size.
A lava balloon is a gas-filled bubble of lava that floats on the sea surface. It can be up to several metres in size.
Source: Wikipedia "Lava balloon" · CC BY-SA 4.0
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