Which of the following is not a defining characteristic of soil?

a. mineral composition

b. humidity

c. texture

d. color

The answer for this question is b. humidity. All the other choices provided are characteristics of soil. Minerals are commonly found in soil because of weathering. Soil can also vary by texture and color, depending on the location. However, humidity is a characteristic of the atmosphere to measure the amount of water vapor (moisture) in the air. Its equivalent in soil characteristics could be moisture content.