100g of hot water at 90degrees celcius is poured into 100g of cold water in the well lagged beaker .the cold water and the beaker were at 30degrees .the temperature of the resulting mixture was 57.1

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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