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Sagot :
When erupted material mixes with river water or melts snow and ice resulting in a volcanic mudflow. Geologist refer to this as Lahar.
A lahar is a powerful form of mudflow or debris flow made up of a mixture of water, stony debris, and pyroclastic material. From a volcano, material usually descends down a river valley. Lahars may flow at speeds of up to 10 meters per second, can reach depths of up to 140 meters, and prefer to demolish any buildings that are in their way.
If lahars happen concurrently with or are caused by primary volcanic activity, they are referred to as "primary" or "syn-eruptive." In the absence of main volcanic activity, "secondary" or "post-eruptive" lahars can form as a result of rainfall during activity lulls or dormancy.
Learn more about Volcanoes here:
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