1 2 3 write down three observations and an inference write down two observations example : there are...

1

2

3

Write down three observationsand an inferenceWrite down two observationsExample : There are three candles

Why did the candles blow out?

Let’s investigate a similar situation…

Lake Nyos, 1986

Where is Cameroon?• Cameroon is located under

a region of volcanic activity

Where is Cameroon?

• The volcanic activity created a chain of islands• The volcanic

activitycreatesvolcanoeson land

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

How did Lake Nyos form?

• Magma may hit wet rock and explode, causing craters

• These cratersmay fill up with water

Carbon DioxideCarbon Dioxide Carbon Dioxide

Carbon Dioxide

CO2CO2

CO2

CO2

CO2

Carbon Dioxide is denser than Oxygen…

O2 O2O2

O2 O2

CO2 = Carbon DioxideO2 = Oxygen

CO2

CO2

CO2CO2

O2

O2O2

O2

O2

EXTRA SLIDES

Carbon dioxide demonstration with balloon and water bottle

Lake Nyos

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