On the morning of May 8, following a powerful explosive eruption, a turbulent cloud of superheated gas and rock fragments called a pyroclastic flow careened down the mountainside at nearly 300 ...

But scientists have long debated how it happened, because the pyroclastic flows of rock fragments, ash and gas that buried him would not have been hot enough, nor cooled quickly enough ...

That is hotter than the pyroclastic flow that buried the city ... Lava is rich in a rock material called silica. When it cools down rapidly, it forms obsidian, a type of natural volcanic glass.

YAMAGUCHI—An eruption of Mount Aso in Kumamoto Prefecture 90,000 years ago created a pyroclastic flow that traveled 170 kilometers north to the Sabagawa river here, the longest such distance ...

Pyroclastic flow. Hot gas, ash and rock mixed together to make a deadly cloud that flows down the side of the volcano. It’s not all bad. They can also be tourist attractions! The lava and ash ...

There is an increased chance of a hazardous eruption, including explosive activity, lava flows, and pyroclastic density currents. Kanlaon, which straddles the provinces of Negros Oriental and ...