Write down three observations

1. 3 2 1 Write down three observations Write down two observations and an inference Example : There are three candles

2. Why did the candles blow out? Let’s investigate a similar situation…

3. Lake Nyos, 1986

4. Where is Cameroon? • Cameroon is located undera region of volcanic activity

5. Where is Cameroon? • The volcanic activity created a chain of islands • The volcanicactivitycreatesvolcanoeson land

6. What is a volcano? • Magma rises up, cutting a cylinder in the Earth • When it reaches the surface, it may cut a hole in the surface and erupt lava and rock

7. How did Lake Nyos form? • Magma may hit wet rock and explode, causing craters • These cratersmay fill up with water

9. Carbon Dioxide Carbon Dioxide Carbon Dioxide

10. CO2 = Carbon Dioxide O2 = Oxygen Carbon Dioxide is denser than Oxygen… CO2 CO2 CO2 CO2 O2 O2 O2 Carbon Dioxide O2 O2 CO2

11. CO2 CO2 CO2 CO2 O2 CO2 O2 O2 O2 O2

18. EXTRA SLIDES

19. Carbon dioxide demonstration with balloon and water bottle

21. Lake Nyos • http://www.bbc.co.uk/science/earth/collections/worst_natural_disasters#p00gttdwstop at 1:59?