Nucleophile, in chemistry, an atom or molecule that in chemical reaction seeks a positive centre, such as the nucleus of an atom, because the nucleophile contains an electron pair available for bonding.
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Answer - Depending on the waves they must measure both at the same station in order to calculate and have knowledge of the interior of the earth.
Reasoning - S waves are sheer waves where as P waves are compressional which leads to both factors of understanding the strength and changes going on in the earth.
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