This PSEB 8th Class Social Science Notes Chapter 2 Natural Resources will help you in revision during exams.
PSEB 8th Class Social Science Notes Chapter 2 Natural Resources
→ Conservation: It means using the available resources carefully.
→ Land: The most important resource.
→ Land may be used for agriculture Construction of Roads, Industries, etc.
→ Soil is the uppermost layer of the earth’s crust.
→ Soil Erosion: The removal of soil, especially topsoil, either naturally or as a result of human activity.
→ Land Use: The use of land for different purposes like agriculture, roads, etc.
→ Terrace Farming: The growing of crops on terraces or steps that have been constructed on hillsides.
→ Topography: A detailed account of the features of a tract of country.
→ Strip Cropping: The growing of narrow strips of Cultivated lands, along the contour lines.
→ Shelterbelts: The planting of rows of trees to check the wind movement, to protect the soil.
→ Deforestation: Cutting down trees.
→ Pollution: Contamination of natural resources.
→ Weathering: The breaking up and decay of exposed rocks by temperature changes, plants, animals, etc.
→ Natural vegetation and wildlife are found in the Biosphere.
→ National Park: A natural area designated to protect the ecological integrity of one or more ecosystems for present and future generations.
→ Biosphere resources: Series of protected areas linked through a global network intended to demonstrate the relationship between conservation and development.
→ The land covers about 29 percent of the total surface area of the earth.
→ Land in India actually under cultivation is about 46 percent of the land.
→ The total land resources in our country are fixed.
→ The importance of soils lies in their fertility and capacity to produce crops.
→ Alluvial soils are mostly found in river valleys and floodplains.
→ About 71 percent of the total surface area of the earth is underwater.
→ Wells, tanks, and canals are different sources of irrigation in our country.
→ Natural vegetation can be broadly classified into forests, grasses, and shrubs.
→ Wildlife refers to plants, animals, birds, and other organisms, which live in their natural habitats.
→ Many countries have taken steps to develop ‘biosphere resources’ to protect wildlife.
→ Ninety percent of the world population occupies only thirty percent of the land area.
→ The remaining seventy percent of the land is either sparsely populated or uninhabited.
→ A dripping tap wastes 1200 liters in a year.
→ Soil formation is a very Slow Process. It takes hundreds of years to make just one centimetre of Soil.
→ The thin layer of grainy substance covering the surface of the earth is called soil.
→ In India, soils are of six types.
→ Water can neither be added nor subtracted from the earth.
→ An average urban Indian uses about 135 litres of water every day.