Why does Rotherhithe tunnel have many bends?

Why did the Olmec civilizations not depend on rivers for growing crops? Who cut down the tree in pretty little liars? What are the modern bridge designs? What is the hole in the ocean called? What is the third longest river in UK? What large body of water is near Seattle Washington? The expedition of balboa and megellan were important because they opened the pacific ocean for spanish exploration and control? When was the Grand Canyon skywalk made? What kind of animals lives longest in zoos? How many years has Mt. Everest been there? Who sings the song in movie due date were they are in the grand canyon? Do plants in the great basin need large amounts of water to survive? What shapes were used to build big ben? What do the different layers of the Grand canyon tell us? Is there a list of Alcatraz Guards and their years? What physical feature separate's the Rocky Mountains and Appalachian? What three forces drive a roller coaster? When was the statue of liberty first opened to be seen? What is the name of the famous theme park in staffordshire? Misprinted 13 cent liberty bell stamp where the preferation runs through the middle of the bell with two opposing halves?