AV, this is the part of creationism that I have a real problem with. Have you ever thought of asking yourself why you or anyone has to go into some totally unfounded assertion about things we know were not true in order to reconcile ones beliefs with the bible. Do we have to make stuff up to keep our faith? There is nothing in the bible that suggests that there were no polar ice caps. The bible speaks of nothing that can be observed outside the ancient biblical lands.
This is probably because you believe in that gnostic creation junk; that the earth was depicted as having some kind of solid dome over it.
Some believe
* that the earth was surrounded by a water canopy that refracted & reflected the sun's rays around it, producing a tropical atmosphere year round.
* I used to be a staunch supporter of the water canopy model, but I'm leaning more toward a giant ice ball (or even ice cube) in space.
Note here in Genesis, it says:
Genesis 1:6 And God said, Let there be a firmament in the midst of the waters, and let it divide the waters from the waters.
Genesis 1:7 And God made the firmament, and divided the waters which were under the firmament from the waters which were above the firmament: and it was so.
Picture the earth at this time as nothing more than a ball of water (Terra Aqua, I like to call it). Now go about five miles underneath the surface of the waters and create a firmament (containment field) and "balloon" the waters out from the earth in all directions (i.e. all 120,600 degrees [360x360]).
You now have the sea, the sky, and the waters which are 'above the firmament'. Those waters are what some say is a water canopy above the earth, that came raining down on it when God 'opened the windows of heaven' in the days of Noah.
You may not agree with this, that's your prerogative ... you paid good money to learn otherwise, and where your treasure is, there will your heart be also ... but anyway, you may not agree with this, but to say ...
The bible speaks of nothing that can be observed outside the ancient biblical lands.
... is assuming too much.