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It is said the earth has formed about 4....

It is said the earth has formed about 4.5 billion years back. How did the earth crust and atmosphere formed according to Big Bang theory?

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It is said there was no atmosphere on early earth and the earth was a hot ball of gases. With the passage of years, the gases condensed into a molten core and different elements got stratified according to their density. Heavy elements such as iron, nickel etc. sank deep into centre and formed the core. Lighter elements like silicon, aluminium etc. formed the middle layer, while the lighter elements like hydrogen, helium, nitrogen etc. formed the gaseous part.
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