This process is known as thermohaline circulation. In the Earth's polar regions ocean water gets very cold, forming sea ice. As a consequence the surrounding seawater gets saltier, because when sea ice forms, the salt is left behind. As the seawater gets saltier, its density increases, and it starts to sink.
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The event of Brexit was when Britain decided to exit from the rest of the European countries. Considering the immigration policy of the Brexit, it decided that it will have the same immigration policy for the European countries like it has for the rest of the countries of the world.
It also decided to cut the number of people entering Britain because it wanted to give more employment opportunities to it's own citizens and reduce other races coming.
New York City and Chicago because for jobs there are lots of jobs that are available in those cities
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During the late 1800s in Poland and Russia, anti-Semitism took the form of violent attacks called pogroms . These attacks forced many Jews to flee to western Europe. Nonetheless, some Jews continued to survive in eastern Europe in small villages called shtetls .
