ICC Soils Certification Practice Test

The correct answer highlights the typical roadway flexible base of crushed stone as the soil type that generally compacts easier. Crushed stone consists of angular fragments that interlock effectively, creating a dense and stable base when compacted. This material can be tightly packed and offers good drainage properties, which are essential for supporting loads in roadway applications.

In comparison, high clay content soils tend to exhibit low permeability and high plasticity, which can make them difficult to compact effectively without adequate moisture management. Fine-grained silt soils, while they can initially seem easy to compact, often poorly retain strength under loading conditions, and their cohesion can result in less effective compaction. Organic-rich soils typically contain decomposed plant materials and have variable structure, which makes them compressible and resistant to compaction.

Thus, the properties of crushed stone make it the optimal choice for applications requiring effective compaction, particularly in road construction and similar scenarios.