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.

d. They are defined by their different physical features.

Explanation:

Horizons is the term used to designate the layers that make up the soil. Each layer receives a letter as identification and has different characteristics. Each shift was formed by the weathering process, which occurs due to the influence of factors, chemical, physical and biological.

As previously mentioned, each layer has different characteristics from each other, which allow a wide interpretation of the soil. These characteristics are physical grades such as color, texture, clay content, viscosity, etc.

For this reason, we can say that the horizon is defined by its different physical characteristics.