﴿ وَٱلَّذِى نَزَّلَ مِنَ ٱلسَّمَآءِ مَآءًۢ بِقَدَرٍۢ فَأَنشَرْنَا بِهِۦ بَلْدَةًۭ مَّيْتًۭا ۚ كَذَٰلِكَ تُخْرَجُونَ ﴾

“And He it is who sends down, again and again, waters from the sky in due measure: and [as] We raise therewith dead land to life, even thus will you be brought forth [from the dead].”

Commentary جَعَلَ لَكُمُ الْأَرْ‌ضَ مَهْدًا (has made the earth a cradle for you - 10) meaning that the comfort provided by the earth is that of a cradle; its apparent look of being a plain floor does not negate its being spherical.