1) Natural disasters a) flood b) overgrazing 2) heavy rain cover dry land a) floods b) drought 3) negative impact of flood a) wash away plant and soil b) plant grow 4) useful effect of flood a) bring new seed and nutrients b) plant die 5) during flood its a) dangerous to leave building b) safe to leave building 6) to prevent flood a) build dam b) make street 7) sand bag a) divert water around sand bag b) make water enter house

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