Fill in the blanks. Soil is the thin layer of material covering the earth's surface and is formed from the weathering of rocks. Land, Soil, Water, Natural Vegetation and Wildlife Resources Q1. Soil is the thin layer of material covering the earth’s surface and is formed from the weathering of rocks. Soil is formed from he weathering of rocks. Soil is the uppermost layer of the earth where the growth of all plant life takes. Soil has been formed from the parent rock material over millions of years. 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. These Extra Questions with solution are prepared by our team of expert teachers who are teaching grade in CBSE … 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). iii. The same applies to the alterations in structure, texture, and other mineral compositions. Examples of sphere-like soil structure: Often compound structures are met within the soil under natural conditions. The National Cooperative Soil Survey identifies and maps over 20,000 different kinds of soil in the United States. The outer layer of the earth is formed of soil. It is a life supporting medium, in which plants can grow. Here, the soil drainage and air space will depend on the resultant soil type and the compaction and cementation process. Soil Formation and Classification. CBSE Class 8 Geography Chapter 2 Important Questions. The soil matures. Time: The formation of the soil is not one day process but requires many years to form. Plains and river valleys offer suitable land for agriculture. Production of humus from decaying vegetation debris will equal its consumption by soil microbae, fauna and flora. Solution Show Solution. 6. Rocks are broken into several fine pieces due to temperature, rainfall and organic materials over a period of time. i. Three-fourth’s of the earth’s surface is covered with water. This physical and chemical decomposition is primarily done by … Very well-formed peds which are quite durable and distinct. There chapter wise Practice Questions with complete solutions are available for download in myCBSEguide website and mobile app. iv. 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 Horizons. ii. 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. Most soils are given a name, which generally comes from the locale where the soil was first mapped. Weathering is a process of physical breakdown and chemical decomposition of rocks and minerals near or at the surface of the earth. The soil will grow in depth through newly formed soil material at the bottom. Community lands are also called common property resources. So when we fall on the ground, our clothes get dirty because of soil. It takes millions of years for the formation of soil. Soil is the uppermost layer of landmass of the Earth. The soil horizons are then cemented by the carbonate, iron, and silica minerals. How is soil formed? Given sufficient time under stable environmental conditions, soils will reach a steady state, whereby soil build-up matches their breakdown. Its thickness varies from few millimeters to … For instance, sandy soils are normally cemented by iron. CBSE Important Questions for class 8 Social Science; CBSE Important Questions for class 7. 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