Yesterday we were blowing up balloons to see how much air pressure a balloon could handle.
We blew and blew and filled the balloons. Too much air increases the pressure and like the magma in a volcano it needs to be released. A balloon will burst or fly around the room if the pressure gets too high.
Inside the Volcano the magma gets bigger and bigger and it looks for the crater to escape. When the magma comes out it is lava that can go hard and the ash clouds go all over the sky.
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