natural resources chapter notes class 9th
Answers
Answer:
Introduction to Natural Resources
Earth is the only one on which life exists. The resources of the earth are the land, the water and the air. Other resources include fossil fuels, sunlight, wind, minerals etc. Biotic factors referred to as living things in the ecosystem. The air, the water and the soil form the non-living or abiotic component of the biosphere.
To know more about Natural Resources, visit here.
Air and Air Pollution
An atmosphere is a layer of gases that surrounds a planet. Atmospheric air has 78% nitrogen, 21%oxygen and, 1% of other gases by volume.
Role of atmosphere
The atmosphere keeps the average temperature of earth steady. It slows down the escape of heat into outer space during the night and prevents a sudden increase in temperature during the day.
Air pollution
Air pollution is caused by the introduction of pollutants, organic molecules, or other unsafe materials into Earth’s atmosphere
Causes: Man-made sources include combustion of fuel, smoke from industries, Burning crackers etc. Natural sources include forest fires, volcanoes etc.
Effects: Respiratory diseases, Global warming, Acid Rain etc.
To know more about Air pollution, visit here.
Ozone layer
The ozone layer is a thin part of the Earth’s atmosphere, which functions as a shield over the Earth’s stratosphere and absorbs the greatest amount of the Sun’s ultraviolet (UV) radiation. The ozone layer comprises high concentrations of ozone (O3) in relation to other parts of the atmosphere.
CFCs
Chlorofluorocarbon (CFC) is an organic compound that contains carbon, chlorine, and fluorine
Greenhouse effect
The greenhouse effect is the natural phenomenon, which occurs when the greenhouse gases present in the Earth’s atmosphere traps solar radiation. Carbon dioxide (CO2), methane (CH4), ozone (O3), chlorofluorocarbons (CFCs), nitrous oxide (N2O) and water vapour (H2O) are called greenhouse gases.
Explanation:
Earth is the only one on which life exists. The resources of the earth are the land, the water and the air. Other resources include fossil fuels, sunlight, wind, minerals etc. Biotic factors referred to as living things in the ecosystem. The air, the water and the soil form the non-living or abiotic component of the biosphere.
To know more about Natural Resources, visit here.
Air and Air Pollution
An atmosphere is a layer of gases that surrounds a planet. Atmospheric air has 78% nitrogen, 21%oxygen and, 1% of other gases by volume.
Role of atmosphere
The atmosphere keeps the average temperature of earth steady. It slows down the escape of heat into outer space during the night and prevents a sudden increase in temperature during the day.
Air pollution
Air pollution is caused by the introduction of pollutants, organic molecules, or other unsafe materials into Earth’s atmosphere
Causes: Man-made sources include combustion of fuel, smoke from industries, Burning crackers etc. Natural sources include forest fires, volcanoes etc.
Effects: Respiratory diseases, Global warming, Acid Rain etc.
To know more about Air pollution, visit here.
Ozone layer
The ozone layer is a thin part of the Earth’s atmosphere, which functions as a shield over the Earth’s stratosphere and absorbs the greatest amount of the Sun’s ultraviolet (UV) radiation. The ozone layer comprises high concentrations of ozone (O3) in relation to other parts of the atmosphere.
To know more about Ozone layer, visit here.
Ozone layer depletion
Ozone layer depletion is the reduction of the amount of ozone in the stratosphere which results in greater UV radiations reaching the earth surface.
To know more about Ozone layer depletion, visit here.
CFCs
Chlorofluorocarbon (CFC) is an organic compound that contains carbon, chlorine, and fluorine
Greenhouse effect
The greenhouse effect is the natural phenomenon, which occurs when the greenhouse gases present in the Earth’s atmosphere traps solar radiation. Carbon dioxide (CO2), methane (CH4), ozone (O3), chlorofluorocarbons (CFCs), nitrous oxide (N2O) and water vapour (H2O) are called greenhouse gases.
To know more about Greenhouse effect, visit here.
Water: A natural resource
Role of water in everyday life: Water forms two-thirds of our body, it keeps the body’s temperature normal, It is also used for agricultural purposes, Domestic Purposes, Industrial Purposes etc. Distribution of water on earth: Only 3% of the water on the surface is fresh, the remaining 97% resides in the ocean.
Water pollution
Water pollution is the contamination of water bodies, caused by discharging pollutants directly or indirectly into the fresh and clean water bodies without adequate treatment.
The main causes of water pollution are
Urbanisation.
Industries
Agriculture
Religious and Social Practices
Withdrawal of water and drying up of water bodies.
To know more causes of water pollution, visit here.
Water cycle
The water cycle, also known as the hydrologic cycle, is the continuous movement of water from the earth’s surface to the atmosphere and then back to the ground.
 Water Cycle
To know more about Water cycle, visit here.
Transpiration and Evaporation
Transpiration is the biological process by which water is lost in the form of water vapour from the aerial parts of the plants called stomata.
Evaporation is a process by which a liquid or solid is transformed into vapour.
Soil
Soil and its formation
Soil is the uppermost layer of Earth’s crust, formed by the continuous weathering of mountains. Factors causing soil formation are:- Parent material, Time, Climate, and Organisms.