Question

why was our earth is round
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Answer 1

First of all your Q is not proper(Grammar mistakes).

And there is no proper answer to your question.

Answer 2

our earth is spherical in shape due to the centrifugal force acting upon it.

this force causes the poles to flatten and the equator to bulge.

the centrifugal force is created due to the earth's rotation on it's axis.

hope it helps!