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[–] Six_Cents ago 

I believe that the firmament was an extremely dense atmosphere covering the planet. In my mind, this would explain a couple of things;

1) Why people lived so much longer before the flood than after the flood (Genesis 6:3). The firmament blocked out virtually all of the harmful radiation from the Sun.

2) How it could rain for 40 days and 40 nights (Genesis 7:11).