This image shows the remains of a lahar on the slopes of Mt. Akutan in Alaska.
Click on image for full size
Image from: U.S. Geological Survey, photo by Robert McGimsey
Hot material from the volcano can melt snow and ice at the volcano summit and cause large mudslides which can sweep rapidly down the mountain. These mudslides destroy almost everything in their path. This type of flow is called a lahar.
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