Because of gravity, gravity forms the earth into a spherical shape, same goes with all the other planets.
The Earth is not round. A pizza is round. The Earth is a sphere.
When a lot of material bunches together by gravity it has so much force that it crushes the material into a sphere. That is because the sum of the gravity from each individual piece of material becomes a single force coming from the center of the assemblage. This single point of gravity is spherically symmetrical. The force is in all directions from the center.
Gravity
The gravity of the Earth tries to pull everything into the centre. Because the mass resists, it remains a large solid body. The most efficient shape that contains matter concentrated towards a single point is a sphere, making the world round.
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