In the Andes Mountains of South America,entire towns of thousands of people have been buried suddenly when water and loose materials travelled downhill as a viscous fluid.Which is this type of catastrophic event?

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The Answer of In the Andes Mountains of South America,entire towns of thousands of people have been buried suddenly when water and loose materials travelled downhill as a viscous fluid.Which is this type of catastrophic event?

In the Andes Mountains of South America,entire Towns of Thousands