Why did a great span, more than half a mile in length and weighing tens of thousands of tons, spring to life in a relatively light wind? and how did slow, steady, and comparatively harmless motions suddenly become transformed into a catastrophic force? to answer these questions engineers began applying the science of aerodynamics to bridge designs determine the meaning of the underlined word in the passage above a. study of wind tunnels c. study of movement of air b. study of bridge motion d. study of cable suspension