particle classification

textural classification

High Way Research Board classification

unified soil classification.

0.5 to 1.0

1.0 to 3.0

3.0 to 4.0

4.0 to 5.0

0.55

0.65

0.75

0.8

The frictional resistance to trans-location between the individual soil particles at their contact point

To the structural relation to displacement of the soil because of the interlocking of the particles

Cohesion and adhesion between the surfaces of the soil particles

All the above.