Mountains is the geological feature that mostly affects the dry climate of Chile.
Explanation :
The Andes affects the dry climate of Chile by stopping the warm air to enter Chile. They collect the cold and dry air coming from the south. The cold dry air comes from Antarctica and which in turn brings no rain in Chile.
In fact, Chile has the driest place in Earth called the Atacama Desert. The reason behind this is that the desert is blocked from moisture from all the sides and hence contributes to the dry weather. The average rainfall in Chile is also very less.
