What is the size range for gravel in millimeters?

• A. 0.002 to 0.075
• B. 2 to 60
• C. 60 to 200
• D. 12 to 200

Answer: (B)

Gravel is classified according to its particle size, and the commonly accepted size range for gravel is from 2 millimeters to 60 millimeters. This classification allows for various uses in construction, landscaping, and civil engineering.

Sizes below 2 millimeters typically fall into the category of sand or silt, while sizes larger than 60 millimeters would be categorized as cobbles or boulders, depending on the exact size. Recognizing these classifications is essential for ensuring that the material used in various applications meets specific engineering and performance criteria, which can significantly affect the stability and characteristics of structures built with these materials.