There are quite a few factors to clear up, which are of course debateable. Sea fossils (whale bones and seashells) on mountains and building formations and old ruins still lay fathoms deep, under the sea. The ice itself wasn't there in places , as you mention of "ice core records" ,where plants for example , are found in ice cores.
These have already been “cleared up.” Long ago. It would be interesting to explore how it is that a modern human of adult age does not know this. And I don’t mean this as snark, either. I mean it as, “what type of communication and authority leads a person to not know that phones work by radio transmission and plate tectonics are responsible for the uplift of former sea-bottom material.”
It’s rather fascinating to think about. This science is so well documented, so well understood, so consilient, that many multiple scientific disciplines all point to the same description and conclusion.
And yet, there are adult humans in the modern nations who still ask, “why are sea fossils at high elevations,” while simultaneously ignoring the simple geometry that could be computed by any 9th grader that proves the extant water on the planet is not suffient to cover mountaintops.
What can we do about the state of our education to overcome whatever source is causing people to not know the answer to this fully-understood natural phenomenon?