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around 4.6 billion years ago, the sun was formed when a cloud of dust and gas called a nebula collapsed under its own gravity. As it did, the cloud spun and flattened into a disk, with our sun forming at its center.
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around 4.5 billions years ago, our Solar System was a disk of dust and gas in orbit sun. The solid materials collided with each other and accreted.
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there's a theory is that there was a large object that hit the Earth and caused chunks of the Earth to fly off, but the chunks of Earth that flies off stayed in orbit, it then cools, and becomes like a sphere forming the moon.
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planetary cooling cooled the planet. Asteroids, and Meteors helped formed the planet into a sphere. There were also volcano eruptions which contained magma . The magma then hardened which created Earth's outer core.
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Earth suffered constant threat from the failed planets, asteroids, falling and hitting Earth. but around 3.8 billions years ago, the giant planets moved to the outer planets which is probably the reason why the rocks, asteroids, failed planets stopped hitting Earth.
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around 1.5 billion years ago the Earth's core was formed, The inner core is Earth's deepest layer. It is a ball of solid iron which is surrounded by a liquid outer core.