Question

how is the earth formed

Answer 1

On my opinion (science opinion)
4.5 billion years ago there was so many dust on our solar system and no planets but gravity change it every 1 dust 1 rock has added the planet became bigger and after
5 million years the earth start cooling. Until comets were attacking as (do you know where the water of earth come from) it come from the metorite that attacing us.