Why do desert habitats have a larger c horizon than other habitats? why are the a and b horizons similar? how does this relate to the yearly rainfall that deserts receive?

This is because the type of sandy soil has less water in rainy weather and the rock continues to have a hard consistency without decomposing. A and B are usually almost the same because they receive water and annually the deserts are filled with a quantity of water making the desert habitats have a broader horizon in comparison with others.