There are many ways to determine the value of currency. One is supply and demand, the more a currency is wanted the value of it will rise. However, if one value rises, the others fall compared to it. That's why currency values change all the time.
A thermocline is a transition layer between warmer water at the surface of a body of water and the cooler deep water that lies below. It is caused by the effect of the sun on the water, in that it keeps the upper parts of the body of water warm whilst being unable to reach the lower, deeper parts.
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