7. "Mount Vesuvius is currently the most threatening volcano in the world, because of the dense population living in the area.”- Prof. Franco Barberi, Rome University Danger: Pyroclastic Flows
9. Lava flows Most flows move very slowly. Will knock down, cover, or burn nearly everything in their path.
10. Volcanic Ash Heavy, made of tiny pieces of volcanic rock. Causes roofs to collapse, makes roads slippery, clogs up machinery, suffocates plants and animals.
11. Mudflows Loose rocks and soil mixed with ice and snow from the top of the volcano. Rivers of ash. Fast moving mudflows have buried entire towns long distances away.
12. Knocks down and burns everything in its path. Fast moving flows can sweep up and over hills then race back downhill. Saint Pierre, West Indies (1902): 30,000 people killed in minutes. Pyroclastic flows
13. Landslides Caused when part of a volcano collapses. Rapid downhill movement of rock and soil. Large landslides into the sea may cause tsunamis.
14. Tsunamis Series of huge waves that are started by earthquakes and volcanoes. Can travel at speeds of 450mph and reach heights of 100 feet.
15. Steam explosions Uncommon, but can be devastating. Happens when lava hits water. May be responsible for the entire island of Krakatau exploding in 1883, causing tsunamis that killed over 36,000.
16. Long-term effects After eruptions volcanoes can remain dangerous for many years. Residual ash can combine with water to form mudflows in areas that receive heavy rains like the Philippines.
17. How dangerous? Rank the following in the order of most to least dangerous. ______ Lava Flows ______ Mudflows ______ Volcanic Ash ______ Pyroclastic flows ______ Landslides ______ Tsunamis ______ Steam Explosions Be ready to defend your choices!
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