yes but that kind of stuff requires thinking, the stupid dont like thinking it gives them a headache. what happens over millions of years, it rains a lot and the earth is in a constant minor earthquake, all the less heavy material would move up in the soil anyway, i mean after a million years. the volcano heats up then erupts because the tectonic plates rub into each other. of course around a volcano youre gonna find foreign stuff that got moved there, thats why there appears a volcano.