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| An avalanche of hot ash, pumice, volcanic gases, and rock fragments that lays low on the ground is called a pyroclastic flow. The temperature in pyroclastic flows can reach 500 degrees or more and it moves fast, 100 kilometers per hour or faster. Anything in the path of a pyroclastic flow is killed. The material in the flow bonds together when it cools because the temperatures were so hot that the particles were melted. |
