Most thunderstorms form by a cycle that has three stages: the cumulus stage, mature stage, and dissipating stage. The sun heats the Earth's surface during the day. The heat on the surface and warms the air around it. Since warm air is lighter than cool air, it starts to rise (known as an updraft)
Politically correct English refers to the act of changing a word or expression instead of another in order to avoid being offensive. This can apply to situations such as sexism or racism. An example of this would be to use the term "Firefighter" instead of "fireman"
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