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But often, a lahar occurs, which are large deposits of muddy debris that can fall away from a volcano with little warning.

Those mudslides are known as lahars in Indonesian, which translates to cold lava.

Cold lava, also known as lahar, is a mixture of volcanic material and pebbles that flow down a volcano’s slopes in the rain.

“It’s a race against time and it’s a matter of life and death but there’s also the danger of rockfalls and volcanic lahar.”

Some lahars move boulders of up to 33 feet in diameter.