Respuesta :
Answer:
The correct answer is heavy rainfall.
Explanation:
A barometer refers to an apparatus that is used to determine atmospheric pressure. As the atmospheric pressure varies with the distance below or above the sea level, a barometer can also be utilized in the determination of altitude. There are two prime kinds of barometers, that is, aneroid and mercury.
A sudden decline in the mercury level in mercury is a sign of heavy rain with a thundering storm.