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.
Answer:
I am confused on what this is supposed to be, but if you are talking about chemicals, then your answer is sulfur.
Hoped this is what you're looking for. Sorry if it isn't. I would love to help, but it needs to be more specific.
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Answer:
Andorra.
Explanation:
The French president is considered one of the princes of Andorra. This started way earlier in the 21st century during the medieval era; and continued till today by the the land locked Andorra between Spain and France. The other prince here is the bishop of Urgell.