The soil horizon is composed of _____.
a.
humus, subsoil, and weathered rock
b.
humus, groundwater, and aquifer
c.
humus, subsoil, and groundwater
d.
humus, groundwater, and weathered rock
a.
humus, subsoil, and weathered rock
b.
humus, groundwater, and aquifer
c.
humus, subsoil, and groundwater
d.
humus, groundwater, and weathered rock