What type of change occurs when water changes from a solid to a liquid? a. a phase change b. a physical change c. an irreversible change d. both a and b

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:

14 days is the half-life of phosphorus-32