Final answer:
When vibrated, cohesive material in wet soil like clay will disperse due to the energy added from the vibration overcoming the cohesive forces between particles.
Step-by-step explanation:
When vibrated, the cohesive material in wet soil, such as clay, will disperse. Clay contains fine particles of silt which give it plasticity; when water is added, it becomes a cohesive product. Vibrating wet soil containing cohesive materials such as clay can cause the particles to move apart, leading to dispersion rather than solidification or hardening. This is because the vibration adds energy to the system, overcoming the cohesive forces between the particles.