Question

why earth is spherical?

Answer 1

Nature creates the best. We cant question on natures creation. We only can say a few purpose for what it has been created.

Here is the same for earth. The scientist gave explanations of the feature of the spherical shape of earth. One of the common explanation was that to achieve sunlight at the greater extent and for more time, the earth is spherical fitted. As sunlight is the main source of life on earth.

Comments

Cause of spherical shape of earth is well explained in the following link.
https://en.m.wikipedia.org/wiki/Spherical_Earth
Please see the discussions under the head "CAUSE"

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Here the mythology of either earth is flat or spherical is given. It explained that earth is really spherical.
Till now, there is no exact explanation of the question "Why it is so? " We can only say it can be the reason.
Also there can be several explanation. some explained it as centered gravity and some in other ways.