If a soil crumbles and falls apart during excavation and can be easily broken into coarse grains, which type of soil is it?

The soil described as crumbling and falling apart easily into coarse grains indicates that it is granular soil. Granular soils, such as sand and gravel, consist of larger particles that do not stick together well and can be easily broken apart. This characteristic makes them less cohesive compared to fine-grained soils, which are typically cohesive and form clumps due to their smaller particle size and higher moisture content.

The physical properties of granular soil also contribute to excellent drainage capabilities and lower risk of instability during excavation. Understanding the behavior of granular soils is crucial for excavation projects because their properties influence how equipment interacts with the soil and how safety measures are implemented.

The other options relate to different soil characteristics, with cohesive soils tending to hold together due to fine particles and moisture, while classifications like Class A and Type B refer to specific designations used in trench safety regulations rather than directly describing soil behavior during excavation.