Northern Hemisphere portrays the upper air westerlies having troughs as well as ridges. The upper air westerlies depicts clockwise curvature in elevation. On a weather map of the Northern Hemisphere, one can see the westerlies among the subtropical highs and subpolar lows.
It's either Coal or Petroleum. I'm leaning more towards petroleum.
Answer:
Black clouds are clouds which probably contains lots of rain and part of it is a thunderstorm. When it's about to rain, clouds darken in colour because the water vapour is clumping together into raindrops, leaving larger spaces between drops of water. You can determine all these by the colour of clouds because the colour of the clouds, the weather.
So the rain clouds appear black or gray with less light reflecting. Clouds become dark or gray before a rainfall.
The funny thing is that immediately we see black or gray clouds, we draw conclusion that it's about to rain. But it is not all the time that when we see black or gray clouds, it's about to rain.
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A tropical cyclone is a rapidly rotating storm system characterized by a low-pressure center, a closed low-level atmospheric circulation, strong winds, and a spiral arrangement of thunderstorms that produce heavy rain and/or squalls
