Carbon has three naturally occurring isotopescu", and "C. C has a C
natural abundance of 98.93 and isotopic mass of 12.000000 amu. * C has a natural
abundance of 1.07and an isotopic mass of 13.003355 amu, and C has a trace (or
negligible) natural abundance and an isotopic mass of 14.003242 amu. What is the
atomic weight of carbon?

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:

gasoline is a mixture. it contains several different kinds of compounds that can be present in a variety of ratios.