Why the earth have morning and night?

Why the earth have morning and night? why did nelson have the idea for earth day 英语翻译：why do i throw up the morning after the night of drinki Why does the earth have four seasons, while the moon does no The earth is ___,It travels al day and all night(travel) 'The ghost must have drunk the night.' and '~~ at the night' does Tom have in the morning?Math and Chinese. Some bands --(stay) up most of the night and that is why the 7.Many flowers open in the morning and close at night 英语翻译One night there was a heavy snow and in the morning,Mr.S soft,cold,and white,they often come at night.in the morning Through The Morning,Through The Night 歌词