The Rocky Tract
وَٱلْأَرْضَ مَدَدْنَـٰهَا وَأَلْقَيْنَا فِيهَا رَوَٰسِىَ وَأَنۢبَتْنَا فِيهَا مِن كُلِّ شَىْءٍ مَّوْزُونٍ
And the earth - We have spread it and cast therein firmly set mountains and caused to grow therein [something] of every well-balanced thing.
Nearby ayahs help place verse 15:19 in sequence and meaning.
وَحَفِظْنَـٰهَا مِن كُلِّ شَيْطَـٰنٍ رَّجِيمٍ
And We have protected it from every devil expelled [from the mercy of Allah]
إِلَّا مَنِ ٱسْتَرَقَ ٱلسَّمْعَ فَأَتْبَعَهُۥ شِهَابٌ مُّبِينٌ
Except one who steals a hearing and is pursued by a clear burning flame.
وَجَعَلْنَا لَكُمْ فِيهَا مَعَـٰيِشَ وَمَن لَّسْتُمْ لَهُۥ بِرَٰزِقِينَ
And We have made for you therein means of living and [for] those for whom you are not providers.
وَإِن مِّن شَىْءٍ إِلَّا عِندَنَا خَزَآئِنُهُۥ وَمَا نُنَزِّلُهُۥٓ إِلَّا بِقَدَرٍ مَّعْلُومٍ
And there is not a thing but that with Us are its depositories, and We do not send it down except according to a known measure.