Give the geographical reason for the following statement :
The soils of the Eastern Ghats are generally not very fertile.
(a) The soils of the Eastern Ghats are mostly developed over ancient rocks like granite and gneiss.
(b) They are mostly in the form of different variants of red soil.
(c) Amongst these, red loamy soil is predominant.
(d) Due to their loamy or sandy nature, they do not retain moisture and are generally not very fertile.