Which of the following statements about horizons is true? . a. they are characterized by whether they are solid, liquid, or gas.. b. they are represented by roman numerals.. c. all soils have completely different horizon patterns.. d. they are defined by their different physical features.

The answer is d. they are defined by their different physical features. A soil horizon is a layer in a soil profile. Horizons are defined by different physical features such as colour or texture. Other features include, structure and permeability. Each horizon is represented by a letter; A,B,C