If a geographer is studying a volcano,

1. the volcano is the result of the physical process

Explanation:

The volcano is a product of the interaction of the various tectonic plates with each other and is a by-product of the collision of the heavy and lighter plates and thereby its formation is affected by the physical process and these are natural process that operates within the earth form millions and billions of years and gives rise to features in earth surface.

The answer would be (c), mass extinctions

Answer glacier terminus;