Pyroclastic flows of 700 degree ash, gas, and pyroclasts moving of around 70 miles per hour swept over the city killing over 20,000 people. A turbulent mixture of very hot gas, ash, and pyroclasts flowing down the side of a mountain at from 70 -200 miles per hour. Describe pahoehoe and aa lava flows.
Pahoehoe lava has a smooth and ropey texture.
Pahoehoe forms when the lava flows at a slower speed, cooling slowly. Aa lava has a rough and fragmented surface. The lava forms when the lava flows at a fast speed, cooling quickly. Name the six eruption types and the three cone shapes. Stratovolcano forms Draw diagrams to represent the six eruption types.