Run in soil description always refers to which of the following measurements?

In soil description, the term "run" specifically refers to a measurement of the soil's depth or thickness where characteristics are assessed. The correct answer reflects the standard increments used in soil assessments, particularly at 25, 50, 75, or 100 millimeters. These intervals allow for a systematic evaluation of soil features such as texture, color, and moisture content at varying depths, which is crucial for understanding the soil's properties and its suitability for various land uses.

Choosing the intervals in the correct answer provides a consistent framework for measuring and documenting the characteristics of the soil. This standardization helps in comparative analysis across different soil types and improves the reliability of the assessments made during soil judging events.