... CBSE Previous Year Question Paper With Solution for Class 12 Commerce; The outer layer of the earth is formed of soil. Time: The formation of the soil is not one day process but requires many years to form. How is soil formed? 6. Production of humus from decaying vegetation debris will equal its consumption by soil microbae, fauna and flora. i. Three-fourth’s of the earth’s surface is covered with water. Soil has been formed from the parent rock material over millions of years. Given sufficient time under stable environmental conditions, soils will reach a steady state, whereby soil build-up matches their breakdown. CBSE Class 8 Geography Chapter 2 Important Questions. Examples of sphere-like soil structure: Often compound structures are met within the soil under natural conditions. Soil Formation and Classification. iv. Land, Soil, Water, Natural Vegetation and Wildlife Resources Q1. The process of soil formation generally involves the downward movement of clay, water, and dissolved ions, and a common result of that is the development of chemically and texturally different layers known as soil horizons. For instance, sandy soils are normally cemented by iron. Weathering is a process of physical breakdown and chemical decomposition of rocks and minerals near or at the surface of the earth. Community lands are also called common property resources. Very well-formed peds which are quite durable and distinct. Soil Horizons. Soil is the thin layer of material covering the earth's surface and is formed from the weathering of rocks. It is soft and porous in nature and contains enough nutrients and water for the growth of plants.Most of the landmass of the Earth is not covered with soil. Soil is the uppermost layer of the earth where the growth of all plant life takes. Soil is the thin layer of material covering the earth’s surface and is formed from the weathering of rocks. Fill in the blanks. myCBSEguide has just released Chapter Wise Question Answers for class 8 Social Science. For naming a soil structure the sequence followed is grade, class and type; for example, strong coarse angular blocky (soil structure). Named soils are referred to as soil series. It is made up mainly of mineral particles, organic materials, air, water and living organisms—all of which interact slowly yet constantly. The soil matures. CBSE Important Questions for class 8 Social Science; CBSE Important Questions for class 7. There chapter wise Practice Questions with complete solutions are available for download in myCBSEguide website and mobile app. Its thickness varies from few millimeters to … Plains and river valleys offer suitable land for agriculture. So when we fall on the ground, our clothes get dirty because of soil. Rocks are broken into several fine pieces due to temperature, rainfall and organic materials over a period of time. iii. Solution Show Solution. The same applies to the alterations in structure, texture, and other mineral compositions. Most soils are given a name, which generally comes from the locale where the soil was first mapped. It is a life supporting medium, in which plants can grow. These Extra Questions with solution are prepared by our team of expert teachers who are teaching grade in CBSE … Soil is formed by breaking down of rocks at or near the surface of the Earth through various physical, chemical, and biological processes by various factors such as the sun, water, wind, and living organisms. Soil is the uppermost layer of landmass of the Earth. This physical and chemical decomposition is primarily done by … The National Cooperative Soil Survey identifies and maps over 20,000 different kinds of soil in the United States. 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