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Presentation transcript:

Quiz/Review Get out a small piece of paper and put your name on it. When the bell rings, the quiz will begin.

Question 1 What areas in New York State are at risk for flooding?

Question 2 Has a hurricane ever hit New York State?

Question 3 What should you do to prepare for a flood?

Answers 1)Low lying areas, near water. 2)Yes 3)Evacuation plan, food, money, Paperwork, stay informed.

Mt. St. Helens Largest landslide in US history May 18, °11′28″N 122°11′40″W Active stratavolcano

Maps

What is…  May 18, 1980 Mt St Helens began to erupt.  St. Helens is known for ash explosions and pyroclastic flows.

Pyroclastic Flow

When…  May 18,1980  October 2004 a lava dome appeared.  Erupted 45 times previously.

Time line  March 27 steam started to vent after an earthquake.  By the end of April a budge was visible.  May 18 th with little warning a large earthquake, started the north slope to begin to collapse.  3.9 million cubic yards slide down slope.  For 9 hours ash rose up to 16 miles into the sky.

What causes this event?  This eruption and following landslide were pre-cursered by medium sized earthquakes.  The Juan de Fuca plate is subducting under the North American plate.  The heat from the eruption melted glaciers rapidly.

Who is affected?  57 people died  250 homes were destroyed  47 bridges washed out  185 miles of highways were destroyed  The summit 9,677 ft (2,950 m) was changed to 8,365 ft (2,550 m)

Possible Warning  Scientists knew with earthquake records that an eruption was possible soon.  With any eruption a major slide and flow was possible.  Evacuation plan Plan ahead. Always have emergency supplies, food, and water stored. Plan an evacuation route away from rivers or streams that may carry mud or debris flow.

Works Cited   lens#Geologic_history lens#Geologic_history  affects.htm affects.htm  May18/OnThisDay1980/Days/1980Septem ber14.html May18/OnThisDay1980/Days/1980Septem ber14.html