To determine a change of elevation on a topographic map what type of math would you use? -subtraction
-addition
-division

-subtraction

Explanation:

Elevation is the altitude of a place above a reference frame.

To find the difference between the elevation between two or places on a map, we perform a subtraction operation.

The differences in elevation is the subtraction of the two elevation values from one another.

For example if point A on a map is at 60m above sea level and point B is at 100m, the change in elevation is;

Change in elevation  = Elevation of B - Elevation of A = 100m  - 60m  = 40m

a characteristic is a deep cut in the earth or left over rock aka till.