Aparichit: It shows that these books were wrote by men who,in that time didn't know that earth is round or elliptical And it travels along a path round the SUN instead of sun rising and setting around or over earth
For the above reply, you ain't a Muslim so you cant understand the verse, you lacked wisdom also to understand the meaning.. Your first verse you quoted 'Sura kahf' that verse was a warning, God is telling human to remember the day He [God] will make the earth flat, when the mountains, hills and valley will collapse, the day when everything on earth will vanish, the only day when only human will be raised from the dead and the judgement shall be passed upon. I hope you get it now and meanwhile, God has said it that, the Quran is a book of wisdom, it requires wisdom to understand, you cannot just start reading it and understand when it is not (Oxford advance learner dictionary), you will need a mentor who has completed learning the book, go to them and they will explain to you. May God lead you to the right path. (AMEN)