VOLCANOES Introduction
Materials expeled (lava, gases)
Materials expeled: mainly gases
Cars covered by ashes from a volcano.
Ashes affecting airplanes navigation
Volcanic products Summary of volcanic products: 1lava, 2gases, 3piroclasts (ashes)
PARTS
Types of eruption: 1 mainly lava: effusive eruption
2: explosive eruption: a lot of gases 2: explosive eruption: a lot of gases. Remind what happens when you open a Campagne bottle.
And there is something worse… Can you distinguish an effusive eruption from an explosive eruption? And there is something worse…
Pompeii. What happened?
An eruption of the Vesuvius in 79 a. d An eruption of the Vesuvius in 79 a.d. It was an explosive eruption but the worst: “nube ardiente”
Draw and show the processes that destroyed Pompeii.
http://videos. howstuffworks http://videos.howstuffworks.com/discovery/28991-assignment-discovery-pompeiis-destruction-video.htm
Nevado del Ruíz (Colombia, 1985): a dramatic disaster
Why are son harmful the eruptions in the upper volcano Why are son harmful the eruptions in the upper volcano? What is the difference between these two volcanoes? The snwo.
HotMelting snowA great amount of water down the hill, water and mud Flood >
Flood
http://www.youtube.com/watch?v=3XMS-quxdGg
Can we predict an eruption? Can we reduce the damages? Can we avoid eruptions? Can we predict an eruption? Can we reduce the damages? 1.Not at all. 2.Sometimes (little earthquakes, gases, hotter water, changes in the shape of the volcano). 3. Prevention (especially not building near the volcano, listening to the authorities, evacuating…).