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well,this is one way, what happens is there is a long line of string which has every 10cm marked out on it. at the bottom of the string is a piece of led to weigh the string down.

you drop the string in the water and bring it back up again when it reaches the bottom of the water. you will know how high it is when you see where the string is wet,then feel your way up to where it's not then calculate how high the sea level is with the 10cm lines marked out

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15y ago

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