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the I think it's because of better educational and job prospects because in the rural areas people there have poor educational centres and some of the jobs don't give enough payment to support their families so they moved to the Urban areas where they can get better education and better jobs too
<span>The year with out a summer happened during 1816 when weather in Europe and North America took a bizarre turn that resulted in widespread crop failures and even famine. Cold temperatures returned. The lack of sunlight became so severe that farmers lost their crops and food shortages were reported in Ireland, France, England, and the United States.
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Answer:
The first theory is: as the cloud collapsed to form a galaxy, it's spin is what determined what type of galaxy it became. Some theorists believe that spiral galaxies were formed from clouds that had a significant spin. ... The second theory is that elliptical galaxies were formed from collisions of spiral galaxies
