dirt
Small particles of soil are called "soil particles" or "soil grains." These particles can vary in size from sand particles to silt and clay particles.
Alluvial soil is the name of rich fertile soil deposited on the riverbank.
The small particles of rich soil can be a number of different materials. Soil is 25% air, 25% water, 45% mineral, and 5% organic matter (of which 10% is organisms, 10% roots, and 80% is humus). The particles you probably see will either be sand, silt, or clay. Sand ranges in sizes from 2.0-0.06 mm, silt 0.6-0.002 mm, and clay to less than 0.002 mm.
Due to very small size of the particles of clayey soil,the particles are packed tightly and therefore can retain water.it is also rich in organic matter so growing of crops such as wheat,gram and paddy the soil which is good at retaining water and rich in organic matter is suitable.therefore,clayey soil have these characteristics useful for crops.
The process of separating soil into its various soil particles and humus is called soil fractionation.
you are likely to find dark, humus-rich soil in an A-horizon profile because that's where dark soil is found & the composition is the particles of weathered rock materials mixed with humus.
sediments
Erosion does not make soil, but rather removes it. Erosion is the process of wearing away or transport of soil and rock particles by wind, water, or ice. This can result in the loss of topsoil, which is the fertile layer of soil rich in nutrients.
Loam
Clay soil has fine particles, which are smaller than coarse particles such as sand. Clay particles are smaller than 0.002 mm in size, making the soil dense and able to retain moisture well due to its small particle size.
Clay rich soil is called clay or clay soil. It is a type of soil characterized by its fine texture and high content of clay particles, which can hold water and nutrients well but may be prone to compacting and poor drainage.
Our Land Is Rich due to its fertile soil - Rich-land