Seismic waves traveling through the earth<span> refract for the same reason that light refracts when entering different substances (e.g. air, water). The inner </span>core<span>has a different density from the outer </span>core<span>, and this difference in density </span>tells<span> us that it is </span>solid<span>.
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Answer: it results primarily from nitrogen dioxide which comes from Combustion and industrial emissions
Explanation: The most important constituent in the production of ozone is nitrogen dioxide. Nitrogen dioxide comes primarily from Combustion of cars and heavy industrial emissions from factories and industries. It can also come from natural sources which includes wildfires.
O It is the global interconnecting web of physical and biological phenomena
<span>o We use it because global change involves the transformations and modifications of physical and biological components of the Earth System through time. Unidirectional change results in transformations that never repeat, whereas cyclical change involves repetition of the same steps over and over again.</span>
