Rationalization of the miraculous

وَإِن يَرَوْا۟ كِسْفًا مِّنَ ٱلسَّمَآءِ سَاقِطًا يَقُولُوا۟ سَحَابٌ مَّرْكُومٌ

And if they were to see a fragment from the sky falling, they would say, "[It is merely] clouds heaped up."