When you have a look at the tire of the car, you will notice that the numbers are written in the following pattern: P215/50R17. What is the Meaning of the First Letter? The first alphabet on the tire can be P, LT, ST or T. Sometimes there is the absence of the first alphabet. The first alphabet denotes:
Clay is one of the three principal types of soil, the other two being sand and loam. A certain amount of clay is a desirable constituent of soil, since it binds other kinds of particles together and makes the whole retentive of water. Excessively clayey soils, however, are exceedingly difficult to cultivate.
Inorganic Materials In Soil. The inorganic materials found in soils account for about half of the total mass of most soil. These inorganic materials take the form of sand, silt and clay, and are referred to commonly as dirt. They form as rocks are eroded by the forces of weather, both wind and rain. Much of the sand and silt is small but visible grains of rock. However, some of it can become so fine that it is microscopic, especially when it comes to clay. Clay is an extremely important part of soil. Because of its porous nature, water is able to seep through clay with ease.