Because the Earth is round.I put a ball on the ground , it stay there !Because the Earth moves.Why does the Earth move? Where does it go?Because the Earth is round, it moves.He wants to go home.It seems interestin to know the Earth to go home .We love our home ,so does the Earth.But where is the home of the earth？His home is where he was born,.你再追问就要扣财富值了，哥。