What statement best describes chemical properties of matter

Chemical properties, such as combustibility, are generally observed as the identity of a substance changes and one or more new substances form. Investigations were carried out in a science lab to explore the topic of chemical and physical changes.

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

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