1. Volcanoes

2. What is a volcano?
A vent where molten rock and gas escape from inside the earth.
Volcanoes transfer energy from the center of the earth to the surface.
Vulcan-God of Fire

3. Types of Volcanoes Shield Built from layers of lava
Non-explosive eruptions
Not steep, but big

4. Types of Volcanoes Cinder Cone Moderately explosive, short explosions
Steep slopes, small size
Built from pyroclastic material

5. Types of Volcanoes Composite or Stratovolcano Most common type
Explosive eruptions and lava flow
Built from pyroclastic and lava flow

6. Stages of a Volcano
Active
Dormant
Extinct

7. Types of Eruptions Non-explosive Lava Flow
Pahoehoe lava-fast moving, low viscosity
Aa lava-high viscosity, rough surface, jagged chunks

8. Types of Eruptions Explosive Pyroclastic Flow Dust-ash
Pebble sized rocks

9. Volcano Stats 1500 potentially active volcanoes in the world.
Less people die from volcanoes than earthquakes, hurricanes, and famines.

10. Volcano Deaths 92,000 Tambora, Indonesia-1815
36,000 Krakatau, Indonesia-1883
29,000 Mount Pelee, Martinique-1902
15,000 Mount Unzen, Japan-1792

11. Pompeii
79 A.D. Mount Vesuvius literally blew its top. Ash and pyroclastic flow covered the city. Sulfuric gas was blown into the air.

12. Mount Pelee, Martinique-1902
An eruption produced pyroclastic flow that destroyed the city of St. Pierre.

13. Mount St. Helens-1980 May 18th, 1980 57 Deaths
Flattened 230 square miles of forest land

14. Mount St. Helens
Before
After

15. Volcanoes in Utah

16. How do Volcanologists predict eruptions
Measuring small quakes
Measuring slope
Measuring volcanic gases
Measuring temperature from orbit