Who is considered a professional soil classifier?

The designation of a professional soil classifier specifically refers to individuals who have the necessary qualifications and training to classify soils accurately. This includes an understanding of soil types, properties, and behavior, which are crucial for applications in agriculture, construction, environmental science, and more. Being registered by the state indicates that the individual meets certain professional standards and is recognized by regulatory bodies, which adds to their credibility and expertise in the field of soil science.

In contrast, other options either limit the qualifications to those who might not possess the specialized training required for soil classification or describe roles that do not encompass the full scope of what it means to be a professional classifier. For example, a person trained only in agriculture may have knowledge of soil but might not have the specific skill set needed to perform classifications effectively. A scientist who studies geological formations may not necessarily have the specialization in soil classification, and a technician conducting soil tests without a degree lacks the formal training and credentials that define a professional soil classifier. Thus, the correct answer reflects a comprehensive understanding and formal recognition of expertise in soil classification.