Environment
Every things in our surrounding, whether living or non living constitute environment. Environment includes everything, that is, vegetation, water, microorganisms, soil, rocks, and atmosphere.
Components of Environment
All the things that exist in the environment has been classified into two groups on the basis of living and non living. Living things are called Biotic components and non-living things are called Abiotic components. Plants, animals, humans, microorganisms etc. are biotic components whereas water, air, soil, rock etc. are abiotic components.
Soil
Soil is a natural resource made up of tiny particles of broken rock, mineral, clay and humus etc. Plants are grown in the top layer of the soil. Soil contains nutrients, water, minerals, humus, and air, which are essential for the growth of the plants. Many living organism like ants, beetles, earth worm, worms, snails etc. make their homes in the soil. Earthworm increases the fertility of the soil by making it porus. Survival on the earth is not possible without soil.
Formation of Soil
Soil is formed by the process of weathering of rocks. Breaking of rocks into smaller particles takes place because of wind, rain and the heat of the sun. Dead plant and animals got mixed up with those broken pieces and results in the formation of soil. It takes thousands of years to break rocks into fine particles. Different types of soils are found in different places of India.
Layers of Soil
The earth is made up of three layers of soil:
Top Soil
Sub Soil
Bed Rock
Top Soil
This uppermost layer is rich in minerals and humus. Humus makes the soil fertile. This layer is soft and can retain water. Hence most plants are grown in this layer.
It also provides habitat to many organisms like earth worm, rat, snakes, beetles etc. This layer is dark in colour.
Sub Soil
It lies below top soil, and is comparatively harder and contains less amount of humus and other nutrients. It is red or grey in colour.
Bed Rock
It lies below subsoil and is soft porus on the upper side and hard non porus in the inner side. It can't be dig manually.
Look at the following picture of the layers of rock:
Types of Soil
Mainly three types of soil are found:
Sandy Soil
Clayey Soil
Loamy Soil
Sandy Soil
It is made up of
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