Answer: contour lines.
Topographic maps are easily recognized by their contour lines.
Birmingham's nickname was "Bombingham" because there had been about 60 unsolved bombings and no one arrested for them.
Complete question:
The average of two number is 55. If 2 is subtracted from the greater number, the ratio between the numbers become 1:2 . The smaller number is
Answer:
The smaller number is 36
Explanation:
let the smaller number = x
let the greater number = y

x + y = 110
y = 110 - x --------- equation (i)

Substitute y in equation (ii)
110 - x = 2x + 2
110 - 2 = 2x + x
108 = 3x
x = 108 / 3
x = 36
Therefore, the smaller number is 36
Tectonic landform, any of the relief features that are produced chiefly by uplift or subsidence of the Earth’s crust or by upward magmatic movements. They include mountains, plateaus, and rift valleys.