by 
Anonymous
ANSWERS: 4
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The earth has weather because it is has water and an atmosphere, is round, has a tilted axis, an elipitcal orbit, and spins.
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Simpler yet...We have weather because the Earth's atmosphere is heated differently in various locations thus causing relative "hot regions". Weather tends to equalize the energy.
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Both of the other answer posted so far contain elements of the truth, but don't get very detailed. We have weather because of two factors. 1) We have an atmosphere and 2) Earth is not heated evenly. The uneven heating results from the fact the Earth is a sphere. Because of this lower latitudes get more of the Sun heat than higher latitudes and half of the Earth is always facing away from the Sun. The difference in heating causes air to circulate from the colder region to the warmer regions and back again. As the air circulates, it carries heat from the warm regions to the cold regions. Now, this is a very simple explanation. Understanding just what causes specific types of weather (i.e. why is it sunny one day and snowing the next) require more detail than I feel like going into right now. It is something that require a couple of weeks of lectures in my Earth Science classes.
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i think that if there was no rotation in the earth we would ae the same weather.
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