12. The diagram below illustrates a feature observed after digging the soil several metres deep Study the diagram carefully and answer the question that follow. P P E PE A B 00 e (a) (b) Identify the feature that the diagram above represents in the study of soil. What is the name given to the part labeled P? ( (c) Give a reason why part P is also referred to as layer of accumulation. (1mk) (d) State two ways in which the knowledge of the above feature would be of benefit to farmer. ​