Answer
Correct order of soil horizons:
O horizon
A horizon
E horizon
B horizon
C horizon
Work Step by Step
The O horizon is the first soil horizon and contains mostly organic material that is alive or in the process of being broken down. The next horizon is the A horizon, also known as topsoil. The next one is the E horizon, also know as the zone of leaching. Then the B horizon which is mostly composed of mineral material. Then finally the C horizon which is similar to the parent material of the soil.
