WHY I THINK THE EARTH IS NOT ROUND.

The greater a concentration of mass is, the stronger its gravitational pull, creating bumps around the globe. This strongly suggests that our globe is not even a perfect oblate spheroid, because mass is distributed unevenly within the planet. Moreover, to even out Earth's imbalanced distribution of mass and stabilize its spin, the entire surface of the Earth will rotate and try to redistribute mass along the equator.

While the earth appears to be round when viewed from the vantage point of space, it’s actually close to an ellipsoid. A surface that may be obtained from a sphere by deforming it. As countless photos from space can attest, Earth is round—the "Blue Marble," as astronauts have affectionately dubbed it. Appearances, however, can be deceiving. Planet Earth is not, in fact, perfectly round. This is not to say the earth is flat.

Before Columbus sailed the ocean blue, Aristotle and other ancient Greek scholars proposed that Earth was round. This was based on a number of observations, such as the fact that departing ships not only appeared smaller as they sailed away but also seemed to sink into the horizon. Isaac Newton first proposed that Earth was not perfectly round. Instead, he suggested it was an oblate spheroid—a sphere that is squashed at its poles and swollen at the equator. He was correct and, because of this bulge, the distance from Earth's center to sea level is roughly 21 kilometers greater at the equator than at the poles.

Gravitational pull of the moon and sun not only cause ocean and atmospheric tides but earth tides as well. Earth's shape also changes over time due to a menagerie of other dynamic factors. Mass shifts around inside the planet, altering gravitational anomalies. Mountains and valleys emerge and disappear due to plate tectonics.