Earthquakes generate compressional waves (p-waves) and shear waves (s-waves). Compared to the speed of shear waves in a given earth material, the speed of compressional waves is the fastest.
Because of this the compressional waves are the first waves to arrive on a complete record of ground shaking. They are also called P waves, which derives from this fact - P is an abbreviation for primary, first wave to arrive.<span>They typically travel at speeds between ~1 and ~14 km/sec.</span>
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One of the major advantages to working outside of China is that production costs can be dramatically lower. For example, in China, labor costs have risen over the past 15- 20 years, whereas in countries like Vietnam, India, and Bangladesh, the cost of labor has remained low. Another advantage is if you choose the right country for your product, it can decrease lead time and increase quality. A third advantage is that producing in other developing countries can help U.S. brands avoid Chinese tariffs.
However, there are also disadvantages to working outside of China.
The main challenge is that the raw material sources outside of China are not as broad as in China. Another is that infrastructure outside of China often lags, which means lead times can become a challenge and production delays can be more common.
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4) to reduce greenhouse gases
I think this would be the Great Wall of China!
although it's actually thought to be much, much longer: over 5000 miles long, if yoiu include natural defensive barriers used in it.
