Put it up front, the soil is defined and group together by their size and mutual interaction. This is the first time i come across this definition which is different form soil mechanics. SO, what we talk about mutual interaction, we talk about things like the friction and cohesion, water content and consolidation ratio.
There are 2 kinds of soil: granular soil and cohesive soil. Sand are (1mm-0.05mm) which give good permeability. On the other hand, silts is 0.05mm -0.02mm they are generally ober consolidated and exhibit some cohesion.
Clay is cohesive soil, if you are city boy and never touch a grain of soil, think of the clay you use to shape your hair. How does it feel like? Yeah their permeability is low meaning they absorb water and they stick together so you can shape your hair.
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