On the medieval world-maps it was represented only the part of the world known as the 'old world', which is consisted of Europe, Asia and Africa. Before the big discoveries, people living in this continents had knowledge only of this part of the world, while South and North America, Australia and Antarctica where still unknown to them, thus they are missing in the world-maps of this period.
Answer:
The cold currents often form when the air on the subtropical high blows over a cold mass of water, then the cold air is dragged to the equator. Warm currents, on the other hand, are large masses of warm water moving further away from the equator, at higher temperatures.
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The baby-boom generation is a generation that has had much different lifestyle than the previous generation, or rather the generation of their parents. The rights of the men and women have become equal, as well as the earnings. The marriage has been delayed for later stages of life, also having less children, and relatively high divorce rates.
On the long run, this generation will have a negative demographic impact on the United States. The reason for that is that the birthrates of this generation have dropped significantly, and it is also representing a large portion of the population, so as they age they will contribute to aging population.
An aging population can have serious economic and social impact, as the percentage of people that take money from the pension funds will increase significantly relative to the people that work. Also, as the baby-boomers age, the healthcare will be overrun by them, as deep age and diseases often goes hand to hand, so the expenses for the healthcare will be enormous.
