The Shape of the Earth

The video discusses historical beliefs that the Earth was flat and how sailors feared falling off its edge. It contrasts this with the modern understanding that Earth is round, supported by photographs from space. However, Earth is not a perfect sphere; it bulges at the equator and flattens at the poles.

How is the shape of the Earth described in relation to a basketball or tennis ball?

What are the two ways in which the Earth is not a perfect sphere?