Question

Why the earth is round in shape?

Answer 1

The idea of the Earth being a flat disc is also inconsistent with the fact that a given lunar eclipse is only visible from half of the Earth at a time. The only shape that casts a round shadow no matter which direction it is pointed is a sphere, and the ancient Greeks deduced that this must mean the Earth is spherical.

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Answer 2

it's in sphere shape and gravity maintains it.

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