Which radioactive isotope is used in treating cancer?
a) carbon-14
b) cobalt-60
c) lead-206
d) uranium-238

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:

answer; talc and gypsum;