The heavy rain and thunderstorm are caused by incoming air mass. Option D is correct.
What is an Air mass?
- It is a volume of air characterized by the uniform temperature and humidity in a large area.
- Two air masses do not mix when they meet instead, they push against each other along a line called a front.
- Cold air mass moves towards the warmer one, it causes warm air to rise which cool down very fast in higher altitude which causes very heavy rain and storm.
Therefore, the heavy rain and thunderstorm are caused by incoming air mass. Option D is correct.
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