jet-black.
Surah 39:21
Do you not see how Allah sends down water from the sky and threaded it as springs in the earth? Then, he brings forth plants of various colors, after which they wither, and you see them turning yellow, and then he makes them into broken stubble. surely, in this there is a reminder for those of understanding.
D) Seas and Ships
Surah 22:65
Do you not see that Allah has subjected to you all that is on the earth, and the ships which run upon the sea by his command? he holds the sky back lest it should fall upon the earth except by his permission. Allah is gentle to people, the most merciful.
Surah 31:31
Do you not see how the ships run upon the sea, by the favor of Allah so that he may show you his signs? Surely, there are signs in this for every steadfast, thankful person.
Do you not see and a Parable in the Quran:
Surah 14:24
Do you not see how Allah sets forth a parable that a good deed is like a good tree, its roots are firm and its branches are very high?
Do you not see: Allah Knows, Hears and Sees all things?
Surah 58:7
Do you not see that Allah knows that which is in the heavens and the earth? There is no secret talk between three but he is the fourth of them; nor between five but he is the sixth of them; nor between fewer or more but he is with them wherever they are. Then, on the day of resurrection, he will inform them of what they have done. Surely, Allah has knowledge of all things.
Do you not see and the History of Man in the Quran:
Surah 2:243
Do you not see those