America is getting further away from Europe. This is not a political statement but a geological fact. Just as the Pacific is getting smaller, the Red Sea bigger, the Himalayas are still going up and one day the Horn of Africa will be a large island. This is the theory of plate tectonics, a revolutionary idea in 20th century geology that saw the continents of Earth to be dancing to the music of deep time. A dance of incredible slowness, yet powerful enough to throw up the mountains and pour away the oceans.
This other teacher´s podcast about Earth Science is also quite nice.
La función del maestro no es explicar (pues, en última instancia, no es posible explicación alguna), sino conducir al alumno a un estado en que pueda comprender por si mismo.