Question

Why earth is round in shape?

Answer 1

actually earth is not round in shape is spherical in shape this is because it is little bit pressed at the poles and bulgy at the sides

Answer 2

The Earth is massive enough that the pull of gravity maintains its roughly spherical shape. Most of its deviation from spherical stems from the centrifugal force caused by rotation around its north-south axis. This force deforms the sphere into an oblate ellipsoid.