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Question Answer Please be so kind as to tell me what separates North and South America. North America consists of Canada, the U.S. and Mexico - the separator is the Central American Isthmus (central American Countries). Just curious to know is there a place called Hidden Valley in the Sacramento area or in Calif. anywhere? As far as I know and have looked there is not actual place with the name Hidden Valley. If you would like to double check this you could go to the zip code directory at your local post office. How many miles long and wide is California? Referred person to another source I tried to find out the population of Harbor city and Wilmington of California. Could you please tell me the population for those two cities and also, please tell me the percentage of each racial group in those cities. Thank you very much. Referred person to another source What is New York's: Site? Situation", Size?, Shape?!! Referred person to another source Since the east coast of the United States has a warmer current than the west coast, does the east coast also have higher mean temperatures than west coast at similar latitudes? Yes What makes the earth spin on its axis? I think its spin is a result of the formation of the solar system, when planetesimals accreted to form the Earth. The solar nebula was a gigantic swirling mass. The stuff that formed the Earth was not only moving around the center, but also spinning about its axis. Why does it (the Earth) spin at its present speed? Conservation of angular momentum. Its spin rate will change whenever there's a net torque acting on it (the tides contribute to this). Its spin rate has changed slowly over the centuries. Has the spinning speed changed during the history of the earth? Yes - the earth is slowing down, and the Moon is getting farther away (by about 3.8 cm per year). Some calculations suggest that the day was only 5 or 6 hours long when the Earth first formed. How do I go about finding out from what direction the wind comes in my area in the winter (Davis, CA)? Referred person to the Climatic Atlas of the U.S.