When a volcano erupts, a glowing sea of molten lava often flows down its sides, destroying everything in its path. A lava flow is unbelievably dangerous. But a volcano can produce something even deadlier: a pyroclastic flow, which is a cloud of gas and rock that can reach temperatures above 1,000 degrees Fahrenheit (537 degrees Celsius). The flow crashes down the side of a volcano like an avalanche. While most people can easily move out of the way of most lava flows, they can't escape a pyroclastic flow so easily. These flows typically reach speeds of more than 50 miles an hour (80 kilometers an hour)
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