Comet showers wouldn't explain things like orogeny, vulcanism, and the slow processes which also precede mass extinctions. If the super continent cycle is linke

Comet showers wouldn't explain things like orogeny, vulcanism, and the slow processes which also precede mass extinctions. If the super continent cycle is linked to Planet X, or merely correlated rather unfortunately in time, that would be quite astonishing but I suppose possible.