Word of mouth, would be your answer.
It is not possible to answer because there is no Conversation. Or the answer would be none because of the same reason.
Anecdotes, passages, or examples are given as evidence to support a point.
If earth was not a connecting system then the heat from its interior wouldn’t have effect on the tectonic plate at all. The heat from the interior causes the tectonic plates to shift, which effects the oceans sea floor and does cause volcanos to be created.
