Since the Geosphere basically describes land, and the hydrosphere describes water, we can say that X makes the heavy rainfall makes a landslide on the side of a mountain
i would say z and x cause the hydrosphere has to do with water so that eliminates x (cause it starts with geosphere) and y can also be eliminated cause sand dunes are not in the atmosphere. im sure thats the answer sorry if im wrong my 2nd logical guess would be w.
