No, the statement is false. A lahar is a very cold or hot (up to 100°c) mixture of rock fragments and water and volcanic tephra that flows rapidly (up to 100s of km/h) down the side of a volcano.
In geography, a lahar is a mud mixture of rock fragments and water commonly known as rock debris.
The formation of a lahar takes place as a result of a volcanic eruption.
If it is an extremely hot mixture then it melts the snow and ice in the surrounding areas thus adding more water into it which becomes runnier and moves down the slope at a rapid rate.
In general, it moves through streams and valleys at a speed of up to 40 miles/per hour.
These are extraordinarily destructive and cause widescale damage on their way down the slope.
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