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NCERT Class 7 Science Extra Questions Chapter Soil  1. What are the factors responsible for soil formation? ( List some processes of soil formation.) The soil is formed when rocks crumble due to weathering and natural erosion. The conditions under which soil weathers determine its properties. The following are some of the most important procedures: Physical Weathering : Physical factors such as the sun, wind, and ice cause changes in temperature or pressure, or both, which increase or decrease the volume of rocks, causing them to crumble. When various chemical components, such as rainfall, react with the minerals in the rocks, new minerals or salts are formed. Biological weathering occurs when living organisms, such as plants, animals, and bacteria, secrete or release acids that corrode the rocks. The foundation aims to support holistic community initiatives in India to address some of the country's most pressing social issues, including health and nutrition, water and sanitation

Class 7 Science Motion and Time What is motion? The motion of an object is defined as the change in its position with respect to time. When the position of an object does not change with respect to time, the object is said to be at rest or stationary.  What is the difference between uniform and non-uniform motion? The differences are- Uniform motion It is a type of motion wherein the object moves in a straight line. Its velocity remains unchanged along that straight line, irrespective of the time duration. It occupies equal distances at equal time intervals. Uniform motion has zero acceleration. The uniform motion and the actual speed of the object are identical. The equal distance at an equal interval of time. The distance to time graph is a straight line. Non-uniform motion Contrary to Uniform motion, Non-Uniform Motion is a type of motion wherein the object moves at different speeds and does not cover the same distance at equal time intervals, irrespective of the duration of the t

Erosion of Soil The erosion of topsoil is referred to as erosion. Deforestation, overgrazing, excessive use of fertilisers or pesticides, precipitation flow, landslides, and floods are all possible causes of erosion. What are the soil conservation methods? Mulching - Mulching aids in the retention of moisture in the soil. Mulching is the practise of covering undeveloped area with organic debris such as straw. Contour Barriers — Contour barriers aid in the prevention of rain-induced erosion. Stone, grass, or dirt connected to the contour forms the contour barrier. To store water, a trench has been dug in front of the dam. Dams, such as rock dams , can impede the flow of water. As a result, rocks are arranged to create a dam. Dams like these impede water flow. As a result, dirt and soil are not lost. Terrace Cultivation : In steep places, terrace cultivation is utilised to decrease erosion caused by water flow. To maintain a flat surface for growing crops, the plots are built in terrac