Identify the step that is NOT a part of decomposition.

Soil erosion

The correct answer is Option (4) – Soil erosion

The step that is NOT a part of decomposition is soil erosion. Decomposition refers to the breakdown of organic matter into simpler substances by the action of microorganisms. The steps involved in decomposition include:

1. Leaching: The process by which water-soluble substances are washed out of the soil or organic material by the action of water.
2. Humification: The process by which organic matter is converted into humus, a dark organic substance rich in nutrients.
3. Catabolism: The metabolic process in which complex organic molecules are broken down into simpler ones, releasing energy.
4. Soil erosion: Soil erosion is the process of detachment and movement of soil particles by water, wind, or other agents. While it may occur in natural environments, it is not a direct part of the decomposition process.