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and there may be vapours within them from which He creates water. Vapours and other forms of air can undergo transformation. For example, if ice is placed in a vessel, water forms around it: this is air that has turned into water, not water from the sky. This shows that there may be water in the earth that has not come from the sky. Thus, one cannot assert with certainty that all water comes from the sky, even if most of it does. And Allah knows best.
وَيَكُونُ فِيهَا أَبْخِرَةٌ يَخْلُقُ مِنْهَا الْمَاءَ وَالْأَبْخِرَةُ وَغَيْرُهَا مِنْ الْأَهْوِيَةِ قَدْ تَسْتَحِيلُ كَمَا إذَا أُخِذَ إنَاءٌ فَوُضِعَ فِيهِ ثَلْجٌ فَإِنَّهُ يَبْقَى مَا أَحَاطَ بِهِ مَاءٌ وَهُوَ هَوَاءٌ اسْتَحَالَ مَاءً وَلَيْسَ ذَلِكَ مِنْ مَاءِ السَّمَاءِ فَعُلِمَ أَنَّهُ مُمْكِنٌ أَنْ يَكُونَ فِي الْأَرْضِ مَاءٌ لَيْسَ مِنْ السَّمَاءِ فَلَا يُجْزَمُ بِأَنَّ جَمِيعَ الْمِيَاهِ مِنْ مَاءِ السَّمَاءِ وَإِنْ كَانَ غَالِبُهَا مِنْ مَاءِ السَّمَاءِ. وَاَللَّهُ أَعْلَمُ.