Question

Soil profile of Clarion soil, one of Iowa's soil types. The soil survey identifies all soil types and gives guidance on the use of more than 400 soil types in the state. Note that the numbers running down the left side are depth in inches. These numbers / lines are not meant to highlight the different horizons or their boundaries.

a. True
b. False

Answer 1

The topsoil in a soil profile is considered the A horizon, while the subsoil is considered the B horizon.

Step-by-step explanation:

The topsoil in a soil profile is considered the A horizon, while the subsoil is considered the B horizon. The A horizon is typically darkly colored due to the presence of organic matter, and it consists of a mixture of organic material with inorganic products of weathering. The subsoil, or B horizon, is an accumulation of mostly fine material that has moved downward, resulting in a dense layer in the soil.