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The earth wasn't formed by asteroids as such, It was formed in the primordial gasses/clouds that formed our particular Sun.

Gravity began to pull the cloud into a several different points, and as gravity pulls anything into it's source, the object begins to spiral, as per a Universal law. the heavier elements that were in the cloud got drawn closer to the centre (Iron etc.) whilst the lighter elements (Helium etc.) still got drawn in but not to the same extent. This is the reason the Gas Giants in our Solar System exist, there simply wasn't enough "Solid" Matter in their respective area's when they began forming

The immense Pressure, Friction and Heat this spiraling caused, made the cloud "Clump" in the points of gravitational pull and elements began to bond to form what we now know are the planets of our solar system.

A little trivia for you as well, the earth could have been much more "Massive" it if wasn't down to the other planets "Hoovering" up the residual elements, especially the Gas Giants, which began at the centre of the cloud and gradually drifted out to their respective positions in our solar system, taking with them some of the heavier elements as they did and then composing themselves of the lighter elements later. thus the reason for some of their Iron Cores.

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