What term is used to describe the combined A and B soil horizons?
Explanation
The A and B horizons together are known as the solum, not regolith or inner core. Since none of the listed options correctly name this, the answer is 'None of these'.
The A and B horizons together are known as the solum, not regolith or inner core. Since none of the listed options correctly name this, the answer is 'None of these'.