The answer is Light Pollution. Light pollution is typically caused in large cities.
I think youre trying to ask what is Washington D.C. the capital of, if thats the case the answer is the United States
The tropical cyclones have a thermal origin, and they develop over tropical seas during late summers (August to mid-November). At these locations, the strong local convectional currents acquire a whirling motion because of the Coriolis force.
