Earth rotates on its axis, and this rotation produces a centrifugal effect that is greatest around the equator. The effect contributes to the equatorial bulge, making Earth slightly wider at the equator than from pole to pole.
Earth is not a perfect sphere; it is more accurately described as an oblate spheroid. Gravitational force holds the planet together, while the rotational effect explains the equatorial shape highlighted in this question.
This fact is useful in physical and human geography because it connects the location, process, and characteristic asked in the question. In examination questions, compare the wording of each option carefully and identify the specific concept rather than choosing an answer based only on a familiar term.

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