Answer:A wave is a disturbance that moves along a medium from one end to the other. If one watches an ocean wave moving along the medium (the ocean water), one can observe that the crest of the wave is moving from one location to another over a given interval of time. The crest is observed to cover distance. The speed of an object refers to how fast an object is moving and is usually expressed as the distance traveled per time of travel. In the case of a wave, the speed is the distance traveled by a given point on the wave (such as a crest) in a given interval of time.
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Both use the method of superposition
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I would think that what with the influx of refugees and widespread immigration in modern times that it would be very unlikely to find one language that is not spoken in mainland Europe. I would suggest that perhaps only the language of a primitive tribe in Borneo or Papua New Guinea that has never mixed with civilization that language may not be spoken in mainland Europe, ie Malayic languages plus the languages of the British Columbia, Canada First Nations probably are not spoken there also.
D. Choosing to move in order to work at a better job.