Some map keys show land elevation using two measurements what are these measurments?

Contour lines and spot elevations are the two measurements used on map keys to show land elevation.

Contour lines are lines drawn on a map that connect points of equal elevation. They are used to show the shape and slope of the land. The closer together the contour lines are, the steeper the slope.

Spot elevations are numbers that show the elevation of specific points on the map. They are often used to mark the highest or lowest point in an area.