The earth is
a. flatter at the poles
b. a perfect sphere
c. flatter at the equator
d. bulging at the poles

A

Explanation:

The earth is slightly flatter at the poles. The radius is less at the poles (3950 miles) than it would be at the equator (3963 miles).

How significant is that? Not very. If the earth was reduced to the size of a billiard ball, the difference in radii would be almost unmeasurable. The billiard ball would be a perfect sphere, the earth is not. It is slightly deformed because it has rotated for millions of years and the equatorial velocity is greater than the polar one causing a slight bulge to be created.

The answer is you want is A.

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