Why is Earth’s shape considered as a Geoid?
The shape of the Earth is considered as a geoid because it is not a perfect sphere, but rather an irregular shape where the gravitational pull is different in different regions. The geoid is a three-dimensional representation of the Earth’s gravitational field and takes into account the bulges and depressions in the planet’s shape. This shape is caused by a combination of the Earth’s rotation, the distribution of mass, and the gravitational pull of the Sun and Moon. As a result, the Earth’s shape is best described as a geoid, a term that comes from the Greek word “geo” meaning Earth, and “eidos” meaning form or shape.