Haryana State Board HBSE 9th Class Science Notes Chapter 14 Natural Resources Notes.
Haryana Board 9th Class Science Notes Chapter 14 Natural Resources
→ Air, water, soil, minerals, living organisms all are natural resources.
→ The air that covers the whole earth like a blanket is called atmosphere.
→ Air is a mixture of many gases, water vapours, soil particles, etc.
→ Temperature on the surface of moon ranges from: 190°C to 110°C.
→ Blowing air is called wind or breeze.
→ During the day, the direction of the wind is from the sea to the land and at night, opposite to it,
→ Rain is the form of water vapours present in the atmosphere.
→ An increase in the content of harmful substances present in air is called air pollution.
→ Life of organism is dependent on water.
→ Addition of undesirable materials in water is called water pollution.
→ Soil is the huge storehouse of minerals.
→ Ground water is also called mineral water.
→ Various nutrients are used again and again in a cycle fashion, this leads to a certain balance between the various components of the biosphere.
→ Pollution of air, water and soil affect the quality of life and harm the biodiversities.
→ We need to conserve our natural resources and use them in a sustainable manner.
→ Greenhouse effect creates warming in the atmosphere.
→ Ozone layer is called protective envelope of atmosphere.
→ Nitrogen fixation is done by bacteria by converting atmospheric nitrogen into nitrates.
→ Natural resources: Useful substances found in nature are called natural resources.
→ Air: Gaseous envelope of gases around the surface of earth is called air.
→ Biosphere: A circle around the earth within the atmosphere, the hydrosphere and lithosphere make the possible by interact each-other, is known as biosphere.
→ Winds: Blowing air is called wind or breeze.
→ Rain: Falling of water from clouds in the form of water droplets on earth is called rain.
→ Air pollution: An increase in the harmful substances present in air is called air pollution.
→ Water pollution: Addition of harmful substances in water is called water pollution.
→ Soil: The uppermost layer of the earth’s crust is called soil.
→ Humus: Substance remains after the decomposition of dead decaying organisms is called humus.
→ Topsoil: The uppermost layer of earth which is made by the mixing of soil particles, humus and organisms is called topsoil.
→ Soil erosion: Cutting or flowing away of upper surface of earth is called soil erosion.
→ Water-cycle: Natural balance made by the exchange of various forms of water in nature is called water-cycle.
→ Nitrogen fixation: Conversion of atmospheric nitrogen into nitrates by bacteria is called nitrogen fixation.
→ Photosynthesis: The process of making starch by the green plants is called photosynthesis.
→ Greenhouse effect: After absorbing the infrared radiations of sun by carbon dioxide present in the atmosphere and to majce the atmosphere warm is called greenhouse effect.
→ Ozone layer: The layer of ozone in the atmosphere which absorbs the harmful ultraviolet radiations coming from the sun is called ozone layer.