Which term best describes the molecular geometry of ethylene, c₂h₄?
(a) linear
(b) planar
(c) pyramidal
(d) octahedral
(e) trigonal

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.

explanation: