for each of the following interactions, identify action action and reaction forces (action reaction pairs): a. a hammer hits a nail b. earths gravity pulls down on you c. a helicopter blade pushes air downward d. you step off a curb e. you pat your friend on the back f. a wave hits a rocky shore

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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