The Tacoma Narrows Bridge was opened to traffic on July 1, 1940 and collapsed on November 7, 1940. One theory created for the bridge's failure is that the pressure of the wind caused the natural frequencies of the bridge to vibrate. This condition is called — amplification

diffraction

reflection

resonance

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Pegmatites are igneous rocks in which the individual minerals are very large. typically, the minerals are all light-colored quartz, feldspar and muscovite. if you were given a black and white photograph of a pegmatite in a quarry (where the rock has been blasted and broken), what physical properties could you use to identify those three minerals in this hypothetical photo? describe each mineral and the specific diagnostic properties. be specific.