# To whom are the contour maps useful?A) MountaineersB) TrekkersC) SoldiersD) All of the above

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A contour line of a purpose of 2 variable quantities is an arc along which the purpose has a continual value so that the arc joins points of identical value. It is a plane segment of the 3D graph of the function f(x, y) analogous to the (x, y)-plane.

A contour map of worldwide crustal width displays the bimodal separation of the earth's crustal width. Ocean basins have $6 - 7$ km impenetrable crust (not counting $4 - 5$ km of water) and continents have an average width of $39.7$ km. The crust is characteristically 30 km impenetrable at the ocean-continent boundary and slowly surges toward the continental inland to $40 - 45$ km. The crust that is bushier than 50 km is constrained to a few areas, counting the Tibetan Plateau of western China, the Andes of western South America, and the Precambrian armor of southern Finland. The contour map only displays large-scale crustal structures; so, some areas of nearby impenetrable crust are not noticeable. The crust does not display a configuration of augmented width with age, as would be the case if it were recurrently exposed to igneous interruptions from the underlying mantle.