Look at our hot-air balloon. It's just a big plastic bag with some thin wire around the bottom. We tried making it go up one cold morning by holding a candle under it. Did it work? No! So we tried tying a cotton-pad under it then soaked it with meths. Did that work? SURE DID! The balloon went way up high and landed in the neighbour' place. We want to have a big launch of lots of balloons - maybe.Our teacher asks us "How does this help us to understand more about WEATHER?"
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