At standard pressure, the total amount of heat required to completely vaporize a 100. gram sample of water at its boiling point is(1) 2.26 x 10 j (3) 2.26 x 103 j
(2) 2.26 x 102 j (4) 2.26 x 105 j

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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