How Can One Volcano Change the World?
ESU301  Rivers of Mud—Lahars
Michael T Dolan, Michigan Technological University


One of the most dramatic changes caused by the eruption resulted from lahars, mudflows of volcanic materials. Following heavy rains delivered by tropical cyclones, these rivers of mud and gravel raced down streams and rivers on the mountain, often burying everything in their path under huge volumes of debris.

  !   Click the image to see a video clip of a flowing lahar.

Make your own mini-lahar!
If you have a sample of volcanic ash available, put a couple of spoonfuls into a disposable cup with about one quarter cup of water, then stir. You can substitute flour or corn starch if you don’t have volcanic ash. Imagine a flood of this messy substance flowing down a mountain!

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