Question

how earth form tell me this

Answer 1

Earth was formed billion or we can say trillion of years ago.
Myself and some of the scientists believe that the Earth was formed when thousands and thousands of comets and some moons collided with each other and formed centrifugal force which started to give shape to the planet....
But at the start the planet was very hot and has took many trillion years to take this shape and structure

Answer 2

Earth formed around 4.54 billion years ago, approximately one-third the age of the universe, by accretion from the solar nebula. Volcanic outgassing probably created the primordial atmosphere and then the ocean, but the early atmosphere contained almost no oxygen.