The miracles of the Qur’an

"If only it were a Qur'an whereby the mountains could be moved, or the earth could be toured, or the dead could be spoken to…"[Surah al-Ra‘d (13): 31] What is it saying?! Are the affairs mentioned in this verse impossible and unrealistic? Or is the verse saying that the people of the Qur'an can do all of these through the Qur'an?!