Students can go through AP State Board 7th Class Science Notes Chapter 15 Soil: Our Life to understand and remember the concept easily.
AP State Board Syllabus 7th Class Science Notes Chapter 15 Soil: Our Life
→ The soil supports all plants, animals, and microorganisms.
→ Almost all the things in our surroundings directly or indirectly depend on soil.
→ Soil is also an essential component of our lives.
→ Most of our daily life activities are closely related to soil.
→ We use soil for various purposes.
→ Soil is good habitat.
→ We depend on soil for agriculture, construction purposes, making utensils, toys, etc Making pots by using soil is called pottery.
→ If the proportion of large-sized particles is more, we call the soil sandy.
→ If the proportion of fine particles is more the soil is clay.
→ If large and fine particles are present in equal proportions, the soil is called loam.
→ Water passing down through the soil particles is called percolation.
→ Soil is made up of distinct horizontal layers.
→ Soil is formed slowly as rock erodes into tiny pieces near the earth’s surface.
→ During heavy winds, we observe that the surface soil particles are carried away by air. It is very important to preserve the fertility of the soil.
→ Soil is a mixture of rock particles and humus.
→ Clay, loam, and sand are types of soil.
→ The amount of water that passes through gives us a percolation rate. It is highest in the sandy soil and least in the clayey soil.
→ The water holding capacity of a soil depends on soil type.
→ Clay and loam are suitable for growing in sandy loam or black soil.
→ The soil profile is a section through different layers of the soil.
→ Removal of topsoil by wind, water, or any other means is known as soil erosion.
→ Clay: a type of soil that can be easy to roll into a ball or ring and not cracked
→ Humus: rich dark organic material in the soil.
→ Loamy: a medium-textured soil containing a mixture of large and small mineral particles. (rich soil)
→ Sandy: very fine loose fragment of crushed rock.
→ Percolation: filtér, especially through small holes.
→ Water retention: water holding capacity.
→ Soil profile: a form of soil.
→ Soil fertility: production of vegetation in soil.
→ Soil erosion: removal of topsoil by wind, water, or any other means.
→ Crop rotatIon: a plant cultivated on a large scale for its produce.
→ Making pots by using soil is called a pottery. This is an ancient creative occupation. During the Harappan civilization, different varieties of designer pots and clay utensils were used. Pottery is a cottage industry in our country. Potters make pots by using clay soil on a pottery wheel.
→ Soil Formation: Soil is formed slowly as a rock (the parent material) erodes into tiny pieces near the Earth’s surface. Organic matter decays and mixes with inorganic material (rock particles, minerals, and water) to form soil. These days farmers test the soil in the field using soil technologies in order to grow suitable crops in the fields. Engineers also test the soil profile before constructing multi-storeyed buildings, bridges, and dams.
→ Soil Science:
Soil science is the study of soil as a natural resource on the surface of the Earth. This includes Soil formation, Classification, and mapping, physical-chemical- biological and fertility properties of soil.
Sometimes terms that refer to branches of soil such as pedology and edaphology are used as if Syno with soil science. The study of the formation, chemistry, more and classification of soil is called pedology’. The study of ii of soil on organisms, especially on plants is called edaphology.
The diversity of names associated with this discipline is related to the various associations concerned. Indeed engineers, agronomists, chemists, geologists, physical geographers, ecologists, biologists, microbiologists, silviculturists, archeologists all contribute to further knowledge of soil and the advancement of soil science.