On which factors does the variety in the
soil depend​

Soils form from the interplay of five main factors namely Parent material, Time, Climate, Relief and Organisms. Parent material: This refers to the mineral material, or organic material from which the soil is formed.

I'm pretty sure it's c. extremely gradual but not 100% sure though.

Answer mauritania is in the northwestern part of african, meaning its in the western hemisphere, and how do i know/ the map showed me so; ///: )