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The Perfect Agent of TravelAirplanes that fly over it - cars, buses and trains that travel on it - all rely on the metals and minerals found beneath the earth's surface. Imagine the size of your world without the cobalt used to make turbine blades in jet engines and gas turbines. Or the steel, iron, copper, zinc and aluminum used in the construction of your car or the barium and the graphite in the brakes. In total, more than 15 metals and minerals are found in your car alone.
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