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Asked by Kizzy to Pierre, Irene, Chloe, NULL, Uday on 13 Nov 2015. This question was also asked by 829ntrd48.
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NULL answered on 13 Nov 2015:
Because of gravity.
A round shape is the shape that gets all the rock, the soil, the water, as close as possible to the centre of the Earth, which is the direction that gravity is pulling everything.
If it was shaped like a cube, or anything else, there would be bits pointing up, and they would soon collapse down, dragged in by gravity.
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Uday Bangavadi answered on 16 Nov 2015:
Gravity… That’s the only reason.. And Round is the only possible to shape which can keep all things on earth near to centre of gravity (core). And also earth is not perfectly round because it’s turning on its axis approximately once every 24 hours, the Earth’s equator bulges.
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Chloe Huseyin answered on 17 Nov 2015:
The Earth is a really cool shape actually, in that it isn’t perfectly round.
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 centre to sea level is roughly 21 kilometres (13 miles) greater at the equator than at the poles.
The shape is also affected by other things and so is not even a perfect oblate spheroid, because mass is distributed unevenly within the planet. The greater a concentration of mass is, the stronger its gravitational pull, “creating bumps around the globe”.
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