Salaam alaikum. I don't know whether or not I am posting in the correct section of the forum- if not, please redirect me and accept in advance my apologies . If my understanding is correct, 21:30-33 describes how God created the heavens and earth. 30Have not those who disbelieve known that the heavens and the earth were joined together as one united piece, then We parted them? And We have made from water every living thing. Will they not then believe? 31And We have placed on the earth firm mountains, lest it should shake with them, and We placed therein broad highways for them to pass through, that they may be guided. 32And We have made the heaven a roof, safe and well guarded. Yet they turn away from its signs (i.e. sun, moon, winds, clouds, etc.). 33And He it is Who has created the night and the day, and the sun and the moon, each in an orbit floating. http://searchtruth.com/chapter_display.php?chapter=21&translator=5#32 I don't see why heaven is described as a "roof" in 21:32. Can anyone chip in and explain this? Take care and many thanks.