Water droplets are seen on the outside of the test tube when copper sulphate is heated

The liquid droplets appearing on the cupper side of test tube are the water molecules that evaparak on heating and condense on touching the cooler surface of upper part of the test tube

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sulfur belongs to group 16 because it can be found in nature whether it is in a free or combined state.

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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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