1. The ability to dissolve in water and to conduct electricity are examples of
a. physical properties.
b. chemical changes.
c. chemical properties.
d. chemical bonding.

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:

c (diamond),

sio2 (quartz)