What do these two changes have in common? melting wax
rain forming in a cloud
select all that apply
- Both are only physical changes
- Both are chemical changes
- Both are caused by heating
- Both are caused by cooling

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: