Why was the area between the Mediterranean sea and the Persian gulf called the Fertile Crescent?

What is a river system? How deep is the Olentangy River? Does foxtail live in the Pacific Ocean? TheGreat Lakes form part of the border between which two countries? What river flows from Minnesota to Louisiana? What are the different types of ocean plants? Niagara falls is a good example of kinetic energy being converted into potential energy? Where do currents form large circles that might take you for an unnecessary spin? How do Chinese try to control the dangerous flooding along the rivers of china? How was the statue of liberty transported across the Atlantic ocean over to the US? What are treatment options for conjoined nerve root? Which salt is most soluble at 10 degrees C? How many people visit the great wall of china in 2012? What is the best cruise company on Yangtze River? Who built the trails for the Grand Cayon? Is walking up stairs carying a large load concentric or eccentric? How much is the toll for a school bus on the Whitestone Bridge? How was a sea created? In 1754 which groups fought over controls over west of the Appalachian mountains? Who is the beautiful woman on Johnny Rivers videos?