Third, sound is a vibration that travels through a medium, like a gas, a liquid or a solid object. A sound's source is an object that moves or changes shape very rapidly. For example, if you strike a bell, the bell vibrates in the air. As one side of the bell moves out, it pushes the air molecules next to it, increasing the pressure in that region of the air. This area of higher pressure is a compression. As the side of the bell moves back in, it pulls the molecules apart, creating a lower-pressure region called a rarefaction. The bell then repeats the process, creating a repeating series of compressions and rarefactions. Each repetition is one wavelength of the sound wave. The sound wave travels as the moving molecules push. Pull the molecules around them. Each molecule moves the one next to it in turn. Without this movement of molecules, the sound could not travel, which is why there is no sound in a vacuum.|As the threat of an invasion of Ukraine again appeared to slip into a holding pattern, Western leaders and diplomats were left scrambling Tuesday to interpret conflicting signals coming out of Moscow. Famously described by Britain's wartime prime minister Winston Churchill as "a riddle, wrapped in a mystery, inside an enigma," Russia put its willingness to play by its own rules on full display with a token withdrawal of some troops exercising in Crimea and the offer of renewed security dialogue with the West. Russia made those gestures after several days of delivering sharp anti-Western rhetoric -. After allied intelligence sources warned again that an invasion could happen as early as today. NATO Secretary General Jens Stoltenberg pointed out that - notwithstanding the messages coming from the Kremlin - Russia still has more than 100,000 combat-ready forces poised on Ukraine's border. Stoltenberg said ahead of a meeting of the Western alliance's defence ministers.




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