Buri sons Vili, Ve, and Odin came cross the giant Ymir the leader of the giant to be good but Ymir was cold hearted and started a battle between the gods and came the dead of Ymir. He was so big they used him to make the world, Skull for sky, teeth for rocks, grinded bones for desert etc. There two main land’s Jotunheim for the giants, Midgard for the humans, and also Asgard home of odin and Hell where bad once go care taker Hilla. This Theory is still around in today’s life will some of it of course. First off the sky or beyond where we believe the god is and for every religion or Myth there is only one god with different name and way to worship. Hell where all the bad people go on Day of Judgment and Heaven they didn’t talk about, where the good people go. Only part is real missing for the today is the Jotunheim land I don’t know if there anything stop us from connecting to god today other than bad angles. My opinion on how they used Ymir to create the world like I said before every myth/religion has its own way of looking at it.
My opinion was focused more no how the world