Please give answer

9a)Gradual fall in mercury level =The weather is going to be bad like stormy weather or thundering clouds.

b)Sudden fall in mercury level = Heavy rain with thundering storm

c)gradual rise in mercury level = Good weather conditions or sunny day
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Which is the correct option
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a)Gradual fall in mercury level=indicates that the moisture is increasing and there is a possibility of rain.
b)Sudden fall in mercury level=it means that the pressure at that place has suddenly decreased which indicates the coming of a storm or cyclone
c)Gradual rise in mercury level=means that the moisture in air is decreasing and this indicates the coming of a dry weather.
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