1. VOLCANOES
Introduction

2. Materials expeled (lava, gases)

3. Materials expeled: mainly gases

4. Cars covered by ashes from a volcano.

5. Ashes affecting airplanes navigation

6. Volcanic products
Summary of volcanic products: 1lava, 2gases, 3piroclasts (ashes)

7. PARTS

8. Types of eruption: 1 mainly lava: effusive eruption

9. 2: explosive eruption: a lot of gases
2: explosive eruption: a lot of gases. Remind what happens when you open a Campagne bottle.

10. And there is something worse…
Can you distinguish an effusive eruption from an explosive eruption?
And there is something worse…

11. Pompeii. What happened?

12. 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”

14. Draw and show the processes that destroyed Pompeii.

15. http://videos. howstuffworks

16. Nevado del Ruíz (Colombia, 1985): a dramatic disaster

17. 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.

18. HotMelting snowA great amount of water down the hill, water and mud  Flood >

19. Flood

22. 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…).