Which of the following is most likely a chemical reaction? Group of answer choices

Two solid powders are combined and shaken. The substances form a mixture.

A solid is stirred into a liquid solution. The temperature of the solution decreases.

Three liquids are poured into a beaker and swirled. One of the liquids settles at the bottom.

A liquid is heated until it reaches its boiling point. Vapor is created.

Two solid powders are combined and shaken. The substances form a mixture.

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explanation:

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.

explanation: