What practical use does adding salt to water have

a. unfreezing glaciers
b. freezing the ocean
c. keeping ponds liquid
d. melting ice on roads and sidewalks

indicate valleys, hills, steepness and gentleness of slopes.

explanation:

contour lines on a map indicate elevation, or depth. numeric notations on contour lines refer to the level of elevation, or height about sea level.

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be