<span>The correct answer is B. People's acceptance of it for exchange. It used to be based on gold but it changed to being what is called a fiat currency. That means that there's no physical commodity that backs its value, but rather its value is backed by supply and demand, by banks and the economy, by people and by the stock market. Many other countries still use gold however to measure the value.</span>
As the sponsor of Christopher Columbus's voyages, Spain was the first European power to settle and colonize the largest areas, from North America and the Caribbean to the southern tip of South America.
Well, when icebergs melt in Antartica and in Greenland this causes the sea level to rise which creeps up on beaches and can take land and submerge it into water.
