Was the Caspian Sea fresh water 7000 years ago?

A high place from which rivers flow is what vocab word? Is the area drained by a river called a flood plain? What eats Black Sea nettles? What is the semiarid region that separates the Sahara Desert from the tropical savanna? What is the name of thinnest river in the world? Does the Kalahari Desert have a mountain or mountain range? Can you drink water from the murrumbidgee? When did the Grand Duchy of Lithuania reach the Black Sea? Where is the Frontier Museum in Williston North Dakota located? How the Nevado del Ruiz effects people? What was the nickname given to Alcatraz island by the convicts and the staff in the book? What is the reference of the black hags in ryder to the sea? Are there maelstroms in the Bermuda triangle? What are common North Carolina beach snakes? In which state are the Aluetian Islands located? Lake Erie Lowlands? Tiny animals called coral polyp secrete limestone create? Who dog has been awarded a star on the holly wood walk fame? What is the nearest NJ shore point to Quakertown PA? What was the dark side of he Hoover Dam?