why is the lower part of the foot of a river bridge made thicker?
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Over, under, or straight through the middle? It's a simple-sounding question, but it's challenged every great engineer since ancient times. We like highways and railroads to be straight and level, but Earth's bumps and wiggles make that kind of construction an amazing challenge. How do you take a highway through a valley or make a railroad cross a creek? The simplest answer is to use a bridge. Sounds easy, perhaps, but which type of bridge do you use? Why are there so many different types and how do they all work? Let's take a closer look and find out more!
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