Answer:
Chemical composition
Explanation:
Minerals are usually classified according to their chemical composition. The chemical composition of a mineral is usually identified through the use of a mass spectrometer. However, to some extent, minerals are also classified according to their physical properties, such as color, shape and sharpness. This is a method that is much more simple and requires less money and time.
Looks right to me if that's what your asking, I be happy to help if not.
Answer:
c. "Currency Exchange"
Explanation:
According to my research on Economics, I can say that based on the information provided within the question the term being described in the question is called "Currency Exchange". When exchanging currency for example, Argentinian Peso (ARS) with United States Dollar (USD), There are two values a sales price and a buying price.
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