What are the units for soil organic matter?Group of answer choicesg/ccmicro m/secin/in%

Breakdown of the Problem

1. Identify what soil organic matter (SOM) is and the context of its measurement.
2. Evaluate the provided answer choices to determine which unit is most appropriate for measuring SOM.

Relevant Concepts

Soil organic matter is typically quantified as a percentage of the total soil mass, indicating how much organic material is present in the soil.

Analysis and Detail

Now, let's examine the options:

1. g/cc: This unit represents grams per cubic centimeter, commonly used for density measurements.
2. micro m/sec: This unit denotes micrometers per second, a measure of speed, and is not relevant to SOM.
3. in/in: This is a unitless ratio, typically used for expressing relative changes (like strain), not for measuring SOM.
4. %: This is a percentage, which is a standard unit for expressing the proportion of soil organic matter within the total soil composition.

Verify and Summarize

Based on the analysis of the options, it's clear that the most appropriate unit for expressing soil organic matter is %, as this reflects the proportion of organic matter present in relation to the total soil mass.

Final Answer

The correct unit for soil organic matter is %.