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Lava from a volcano is one of the hottest things on Earth.

Lava from a volcano is one of the hottest things on Earth.

Lava is melted rock that glows bright orange because it is so hot. It is far too hot to touch — even hotter than an oven!

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Hot and cold are opposites — fire is hot, ice is cold. Hot and cold are opposites — fire is hot, ice is cold. Ice is just water that got so cold it turned hard. Ice is just water that got so cold it turned hard. A thermometer tells us how hot or cold something is. A thermometer tells us how hot or cold something is. The Sun is hot, but outer space is very, very cold. The Sun is hot, but outer space is very, very cold. The Sun's surface is so hot it would melt almost anything. The Sun's surface is so hot it would melt almost anything.