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

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Presentation on theme: "1 2 3 Write down three observations and an inference Write down two observations Example : There are three candles."— Presentation transcript:

1 1 2 3 Write down three observations and an inference Write down two observations 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 under a region of volcanic activity

5 Where is Cameroon? The volcanic activity created a chain of islands The volcanic activity creates volcanoes on 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 craters may fill up with water

8

9 Carbon Dioxide

10 CO 2 Carbon Dioxide is denser than Oxygen… O2O2 O2O2 O2O2 O2O2 O2O2 O2O2 O2O2 O2O2 O2O2 O2O2 CO 2 = Carbon Dioxide O 2 = Oxygen

11 CO 2 O2O2 O2O2 O2O2 O2O2 O2O2 O2O2 O2O2 O2O2 O2O2 O2O2

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18 EXTRA SLIDES

19 Carbon dioxide demonstration with balloon and water bottle

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21 Lake Nyos http://www.bbc.co.uk/science/earth/collectio ns/worst_natural_disasters#p00gttdw stop at 1:59? http://www.bbc.co.uk/science/earth/collectio ns/worst_natural_disasters#p00gttdw

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