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Chemistry refers to the study of the nature, properties, and composition of matter, and how such undergo modifications. That served as a completely adequate statement as late as the 1930s, when natural science (that is the systematic knowledge of nature) seemed fairly obvious divisible into the physical and biological sciences, with the previous being included of physics, geology, chemistry, and astronomy and the later involving of botany and zoology. This categorization is still employed, however the emergence of significant fields to study such as oceanography, paleo-botany, pharmacy, meteorology, and biochemistry, for illustration, it is clear that the dividing lines among the sciences are no longer at all sharp. Chemistry, for illustration now overlaps so much with geology (therefore we have geochemistry), astronomy (astro-chemistry), and physics (that is physical and analytical chemistry) which it is probably not possible to devise an actually good modern statement of chemistry, apart from, perhaps, to fall back on the operational statement.

Chemistry plays a significant role in all of the other natural sciences, fundamental and applied. The plant growth and metabolism, the creation of igneous rocks, the role played by ozone in the environment, the degradation of ecological pollutants, the medical act of drugs, the properties of lunar soil, and organization of forensic evidence: none of these can be understood devoid of the knowledge and perspective given by chemistry. Indeed, most of the people study chemistry so that they can relate it to their own specific field of interest. Obviously, chemistry itself is the field of interest for most people, too. Numerous study chemistry not to apply it to the other field, however simply to learn more about the physical earth and the behavior of matter from a chemical point of view.

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