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The Earth is thought to have been formed about 4.6 billion years ago by collisions in the giant disc-shaped cloud of material that also formed the Sun. Gravity slowly gathered this gas and dust together into clumps that became asteroids and small early planets called planetesimals. These objects collided repeatedly and gradually got bigger, building up the planets in the Solar System, including the Earth.
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The outer core was made 25 million years after the earth was made of molten rock and metal. The outer core of the Earth is a fluid layer about 2,300 km (1,400 mi)[1] thick and composed of mostly iron and nickel that lies above Earth's solid inner core and below its mantle.
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About 4.5 billion years ago, the giant impact hypothesis suggests that the moon formed when an object smashed into early Earth. Earth formed from the leftover cloud of dust and gas orbiting the young sun, One of these could have crashed into Earth not long after the young planet was created.
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About 4.5 - 3.8 billion planetary cooling formed the planet into a molten planet. Clumps of asteroids, meteors, and comets helped formed the planet into a sphere.
There were volcanic eruptions as well which contained magma. The magma then hardened which created Earth's outer core. -
About 4 to 3.8 billion years ago after a time of comet and asteroid bombardments that hit other planets including Earth.s
