describe the layer of soil with the help of labelled diagram
Answers
The soil has taken thousands of years to form. Soil formation takes place in the following ways:
Big rocks break down into smaller rocks by continuous action of wind and rain. It takes many years for these rocks to break down into smaller rocks.
Rocks are mainly broken by two types of weathering- physical weathering and chemical weathering. A number of natural force, called agents, work to break down the parent rock into tiny particles of soil. These agents include wind, water, the sun’s heat, and plants and animals.
These pieces get further broken down to form sand and silt and, ultimately, into finer particles and the process continues. This process is very slow. It takes thousands of years to form a just 1cm layer of soil. These fine particles form the top layer of the soil.
Answer:
A- Horizon (The Topsoil)- The uppermost layer of soil exposed to air is the topsoil. The topsoil is the most useful part of soil. It is Soft, porous and capable of holding good amount of water.
B-Horizon (The Subsoil) - the sub soil is poor in humus, but rich in minerals.it is rich in soil water and home to many burrowing animals.
C-Horizon (The Substratum) - The substratum includes big pieces of broken-rocks formed as a result of partial weathering of rocks. The substratum may hold water and some minerals.
The Bedrock - the bedrock is hard solid rock layer impervious to water. It may hold water (groundwater) with dissolved minerals. Wells or tube wells are dug to reach the bedrock to draw groundwater collected on it.