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compression |
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During the Jurassic to Cretaceous periods (160 to 130 Ma), these rocks were subjected to compressional orogenesis related to large-scale plate convergence. Bullen had studied one type of vibration--called compressional or P waves--which travels through materials by jiggling molecules parallel to the direction of the wave. When a car moves, explains aeronautics professor Drela, it presses against the air and forms compressional waves--alternating areas where air molecules are pushed together and spread apart. |
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