In a couple million years or so, Mount Etna, I think, will weather down and eventually become a flat surface. It might even grow taller due to plate tectonics. Mount Etna is one of the tallest mountains on the Earth, therefore it might not weather down as fast as all of the other mountains on this Earth. Mount Etna was formed by colliding plates that made a mountain that is sky high. Mount Etna is one of the tallest mountains on the planet.