﴿ ٱلَّذِى جَعَلَ لَكُمُ ٱلْأَرْضَ مَهْدًۭا وَجَعَلَ لَكُمْ فِيهَا سُبُلًۭا لَّعَلَّكُمْ تَهْتَدُونَ ﴾

“He it is who has made the earth a cradle for you, and has provided for you ways [of livelihood] thereon, so that you might follow the right path.”

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.