And the earth – We have spread it and cast therein firmly set mountains and caused to grow therein [something] of every well-balanced thing.
The following excerpt is taken from Tafsir Abdullah Yusuf Ali surah 15 pg. 10-11:
And the earth We have spread out (like a carpet); set thereon
mountains firm and immovable
C1955. Majesty, order, beauty and harmony are shown
in all Allah’s Creation, but especially in the heavens.
Coming nearer to man, Allah’s care for man and His
goodness are shown (besides His other qualities) in His
creation of the earth.
In highly poetical language, the earth is described as
spread out like a carpet, on which the hills act as weights
to keep it steady.
and produced therein all kinds of things in due balance.
C1956. And every kind of thing is produced on the earth
in due balance and measure.
The mineral kingdom supports the vegetable and they in
their turn support the animal, and there is a link of
mutual dependence between them.
Excess is eliminated. The waste of one is made the food
of another, and vice versa. And this is a chain of
gradation and inter-dependence.
Yusuf Ali, Abdullah. Translation and Commentary of the Quran. (surah 15 pg. 10-11). http://www.quran4u.com/Tafsiraya/Index.htm