I feel like it’s C I don’t even know but I just have a feeling that is C
I would venture to say that the country in South America that has the least amount of disposable water would be probably in northern Chile which is a desert ie the Atacama desert which stretches from the Pacific across to the Andes Mts while on the other hand, in southern Chile there is a temperate climate with significant rainfall and considerable disposable water.
A slow change to the earth's surface would be the formation of mountain ranges over millions of years due to the shifting of tectonic plates under the earth. Also, another slow change could be considered erosion or weathering. Two rapid changes could be landslides and earthquakes.
