Question

how has earth formed?

Answer 1

earth is formed due to sepration of diffrent ball
from nebula

Answer 2

Hey Friend, Here's Your Answer

Actually Friend, Millions Of Millions Years Ago,
According to Scientists,

There was a large Explosion in galaxy, Called Big Bang Theory By Stephen Hawking.

In This There was a large largest Explosion Every, Due to this There were very small pieces, Which eventually cooled Down.

One of this small piece is Earth,
It slowly cooled down and the atmosphere today were the gases of that time

Which cooled down and formed Earth

Thanks
Hope this Helps