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- As the wind blows across the sea, it picks up moisture.
- When the moist air encounters the highland, it is forced to rise.
- As the air rises, temperature decreases and relative humidity increases.
- At dew point temperature, the air is saturated and condensation occurs
- where water vapour condense to water droplets to form clouds.
- When the water droplets are too heavy to be suspended,
- they fall as relief rain on the windward side of the highland.
- As wind continues to blow the clouds towards the leeward side of the mountain
- There is lesser water vapour and no more precipitation, leaving it dry
(a)(ii)
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Name an instrument used to obtain the readings for rainfall and explain
where the instrument should be placed in order to get accurate
measurements of the daily rainfall. [3]
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- Instrument = rain gauge (ignore spelling error of ‘guage’)
- Open grassy area / open field to reduce evaporation
- as it is cooler in the ground than on a concrete surface.
- And to prevent water on concrete surface to splash into the raingauge
- Away from buildings and trees to prevent raindrops from buildings and trees from dripping into the rain gauge or fallen leaves and
- twigs from choking the funnel
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