What Happens When You Pour Lava Onto Ice?
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You would think that molten lava being so hot (2,100 °F) would just melt through the ice. Not so.

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Instead of flash-boiling the ice, lava actually slides down the cold surface. A thin layer of ice does melt immediately, allowing the lava to hydroplane across the surface as it cools. Because there is so much surface area, the molten rock starts to solidify quickly as the ice is heated and becomes a gas. The flows created by this interaction form bubbles. The water vapor can blow bubbles of lava as large as a soccer ball. Some of these bubbles burst, but others remain after the lava cools. Now you have bubbles made of rock. The walls are so thin that they are flexible like plastic wrap.
Lava refers both to molten rock expelled by a volcano during an eruption and the resulting rock after solidification and cooling. This molten rock is formed in the interior of some planets, including Earth, and some of their satellites. When first erupted from a volcanic vent, lava is a liquid at temperatures from 700 to 1,200 °C (1,292 to 2,192 °F). Up to 100,000 times as viscous as water, lava can flow great distances before cooling and solidifying because of its shear thinning properties.[
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