– What are tectonic plates and what contributes to their movement and in turn, the deadly earthquakes?

Question

– What are tectonic plates and what contributes to their movement and in turn, the deadly earthquakes?

In: 4

Answer 1

As kind of a follow up question, so we have earthquakes because what is below the crust after 4.5 billion years is still not solid. Is the core now so well insulated that it will continue to be not solid till the sun burns out or will a very distant future earth be earthquake free?