So what is “ours” is ultimately God’s, including whatever he gives to us. But that is every bit as true here on earth as it is in Heaven. And the fact that God owns whatever is “mine” does not mean there is no distinction between what I own and what others own.  

The point isn’t that God had not created the seas. The point is that the seas (or oceans) as we now know them may be radically different than the original seas

Whether or not Heaven operates outside the scope of earth’s time sequence, clearly the inhabitants of Heaven track with events happening in time (Rev. 2-3).

No. Angels and human beings are entirely different creatures.

“Let temporal things serve your use, but the eternal be the object of your desire.” Thomas a Kempis

I think there will be clothes on the New Earth, first because those in Heaven are depicted as wearing robes (e.g. the martyrs in Revelation 6:9).

Part of what we need to ask ourselves is why we would assume that we would not do many of the same things.

I believe that as finite human beings who will live in space and time, we will go through a never-ending process of learning in Heaven, in that we will learn MORE as time goes on (Eph. 2:7). However, 1 Cor. 13:12 seems to suggest there will be immediate clarity of vision in God’s presence.

The answer is yes, at least to some extent.