Agronomy Degree Practice Exam

What are solid particles between 0.02 to 2 mm in diameter called?

1. Silt

2. Clay

3. Loam

4. Sand

The correct answer is: Sand

The solid particles that range in diameter from 0.02 to 2 mm are classified as sand. Sand is a key component of soil texture and plays a significant role in determining the physical properties of the soil, such as drainage, aeration, and nutrient-holding capacity. Particles of this size, due to their relatively larger diameter compared to silt and clay, contribute to the sandy texture that influences how water moves through the soil and how well the soil can support plant growth. Sand typically provides good drainage while retaining less moisture than finer particles, which can be beneficial for certain crops and conditions. Understanding these distinctions in soil texture is critical for effective agronomy practices, allowing for better crop management and soil health assessments. The other options refer to different soil particle sizes: clay consists of particles smaller than 0.02 mm, silt falls in the range between 0.002 mm and 0.02 mm, and loam is a mixture of sand, silt, and clay, providing a balance of texture and properties beneficial for cultivation.