Why are red soils not suitable for agriculture?

Red soil might not be suitable fit for agriculture because it might not contain the suitable minerals which are necessary for the growth of the crop on which it is grown. Red soil has the least water holding capacity and has very much amount of iron and phosphorus which is very harmful for the crops.

d. i., ii., iii., and iv.

answer is  

loa ≅ lma

to prove that the triangles are congruent using the aas congruence