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for a) the sea water gain heat from the surrounding air and evaporate. the warm water vapour touch the cool inner surface of the plastic sheet amd condense to form water droplets.these droplets roll down into the cup as the stone directs the droplets there

for b) the sea water has less exposed suface area for the water to evaporate. so that means that less water is being evaporated and so less water condense into droplets and thus less water is collected

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