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Transcript of Volcanoes
- Cinder Cones: Circular or oval cones made up of small fragments of lava that have been blown up in the air, cooled and fallen back into the volcano.
-Composite Volcanoes: Steep sided volcanoes made of many layers of volcanic rocks.
- Shield Volcanoes: Volcanoes shaped like a bowl or shield in the middle with long gentle slopes.
- Lava Volcanoes: Volcanoes formed when erupting lava is too thick to flow and make a steep-sided mound as the lava piles up near the volcano's vent. Cinder Cone volcano Composite Volcano Shield Volcano Lava Volcano Name: Mount Pelee
Date of eruption: 1902
Impact: It let out a glowing cloud of ash and rock and destroyed the city of St. Pierre in a matter of minutes. Name: Krakatoa
Location: The Indonesian island of Krakatoa
Date of eruption: 1883
Impact: It was 13,000 times the power of an atomic bomb and was heard as far off as the eastern coast of Africa an estimated 36,000 people died. Island of Krakatoa Name: Ejafjallajokull (pronunciation: Eye-a-fyut-la-jo-kull) it means "Island mountain volcano"
Date of eruption: March 20, 2010
Impact: It cast a cloud of ash across the entire continent of Europe shutting down airports and costing the airline industry more than 1 billion dollars. There are a some signs a volcano might give off before an eruption:
- The magma chamber will collect magma
- The magma chamber gets so full the lava will come to the surface
- Then it starts to swell These are some tools a volcanologist might use. A seismograph, it finds small earthquakes which mean an eruption is coming. Correlation spectrometers, they measure the amount of volcanic material. Tiltmeter, they see how much bigger a volcano gets after an eruption. Thermometer, they measure how much gas is is the volcano. These are some volcanoes that have been predicted:
- Mt. Kilauea, Hawaii
- Mt. Pinatubo, Philippines
- Mt. Saint Helens, Washington State
- Mt. Etna, Italy Are scientists very accurate about predicting volcanoes? Scientists are almost always correct, but every once in a while they don't get it completely right. It's like predicting weather. They're normally correct that a volcano will erupt just not the exact time it will erupt. By: Theo Wyss-Flamm The End!!! Thanks for watching!! Name: Mount Saint Helens
Location: Washington state
Date of Eruption: May 18, 1980
Type of Volcano: Composite Volcano
Impact: On March 17 it blew a crater through its ice cap. At first there was a 5.1 earthquake which triggered a landslide. The blast was heard in California. It was the worst volcanic disaster in US history. 57 people died California Name: Thera
Location: The Greek island of Santorini
Date of Eruption: 1883
Impact: The eruption was four or five times the explosion of Krakatoa. The eruption blew a hole in the Aegean isle sending out shock waves that would reverberate for centuries to come.