Movement of soil particles in wind erosion is initiated when the pressure by the wind against the surface soil grains overcomes the force of gravity on the grains. Certain minimum wind velocity is needed to initiate movement of soil particles. The velocity at which movement of most erodable soil particles is initiated is known as minimum fluid threshold mother velocity. It depends on the size and weight of soil particles and the friction provided by neighbouring particles. This threshold velocity is the lowest for grains.1.15 mm dia. Velocities exceeding about 3 km hr-1 are turbulent and are responsible for initiating the process of wind erosion. As the wind velocity increases beyond this minimum, bigger particles start moving till the movement of almost all the size of particles in a soil containing only erodable fractions is initiated. This critical velocity is known as maximum fluid threshold velocity. In practice, no maximum fluid threshold velocity exists as the soils contain both erodable and non-erodable fractions together.
Some soil particles of.5 mm size rise only a little distance upwards. Others may move 30 cm upwards. (ii suspension: Very fine feed soil particles, of less than.1 mm are kicked upwards by the action of soil particles in saltation to form suspensions of very fine soil particles in air which are carried away. (iii surface creep: soil particles of size between.5 to 1 mm are pushed along the surface by the impact of soil particles in saltation. About 90 per cent of the soil particles move within 30 cm and about 50 per cent of the soil particles move within 5 cms from the ground surface, by the action of the wind. The control of wind erosion is based on reduced or elimination of particles in saltation. Mechanism of Wind Erosion: Lifting and abrasive action of wind results in some detachment of tiny soil particles from the granules or clods. The impact of these rapidly moving particles dislodge other particles from clods and aggregates. These dislodged particles are ready for movement.
(ii) loose, dry soil at the surface. (iii) Wind strong enough to begin the saltation (sand movement) process. The wind velocity that causes sand movement is about 28 kph. The process of wind erosion consists of three phases: initiation of movement, transportation and deposition. About 33 M ha in India is affected by wind erosion. This includes.49 M ha of desert and about.5 M ha of coastal sands. Kinds of Wind Erosion: The wind is responsible for the removal of soil particles by the following three kinds of erosion is semi-arid and arid region: (i saltation: The soil particles of size.1.5 mm are pushed along the surface of the land. They collide with other soil particles and leap vertically upwards. This phenomenon is called saltation.
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Here is an essay on Wind Erosion for class 8, 9, 10, 11 and. Find paragraphs, assignments long and short essays on Wind Erosion especially written for school and college students. Essay contents: Essay on the meaning of Wind Erosion. Essay on the kinds of Wind Erosion. Essay on the mechanism of Wind Erosion. Essay on the factors Affecting Wind Erosion. Essay on soil Loss Estimation, essay on the control of Wind Erosion.
Meaning of Wind Erosion: Erosion of soil by the action of wind is known as wind erosion. It is a serious problem on lands devoid of vegetation. It is more common in arid and semiarid regions. It is essentially a dry weather phenomenon stimulated by soil moisture deficiency. For wind erosion to occur, three conditions have to be met: (i) Insufficient ground covers ( 50 of the surface covered by non-erodible elements, be it homework stubble, pasture residues, gravel or very coarse sand).
Deforestation is a big problem in India as well as other countries. It is a global issue arising as the big environmental and social issue around the globe. Deforestation disturbs the human lives by causing several imbalances ecologically and environmentally. Deforestation is alarming continuously and indicating the need to stop cutting plants for the safety of human lives. Some people are doing deforestation to fulfill their greediness of earning money from wood.
People are cutting plants for their agricultural activities, logging (to make papers, match-sticks, furniture, etc urbanization (road construction, housing, etc desertification of land, mining (oil and coal mining fires (to get heat etc. Deforestation is affecting the health of human being and fresh environment through climate imbalance, increasing global warming, soil erosion, floods, wildlife extinction, decreasing level fresh oxygen and increasing carbon dioxide gas and many more. Deforestation is very necessary stop in order to run the life as usual in better way. There should be some strict rules and regulations by the government of the country which everyone must follow to check deforestation. There should be simple and easy ways to make common people aware about the causes and effects of deforestation. Population should be controlled to lessen the need of forests cutting. Whenever any plant is cut, there should be rules for replanting the plants in the place of old one. Deforestation Essay 6 (400 words). Deforestation is the permanent destruction of the forests in order to enhance sources for life and use of woods.
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Natural habitat paper of the most important animals is destroying because of this some are migrating to other areas or entering to the human areas or dying. We need to preserve trees by stopping the forest cutting or replanting the plants in order to save the animal sanctuary and maintaining the natural cycles of the environment to save the life here in future. Preservation of forests is also necessary to get fresh and healthy oxygen as well as reducing the amount of carbon dioxide gas. Deforestation lead to increasing essay air pollution, increasing level of poisonous gases in the environment, increasing soil and water pollution, increasing environmental heat, and many more. All the negative effects of deforestation cause many health disorders and most importantly lungs and respiratory problems. Deforestation Essay 5 (300 words deforestation is the finishing of the forests by the human beings. Increasing human population day by day is increasing the need for land on the earth for agricultural, industrial, residential, commercial, cities and other purposes which involves permanent forest removal. In the last century, our earth was covered with the forests everywhere however now-a-days only some counted forests exist.
By cutting the forests we are stopping all the positive activities done by forests in the favour of human and environment. Deforestation Essay 4 (250 words deforestation is the rapid loss of forests by cutting plants regularly without replanting. It is endangering thesis the wildlife, human health and environment. Increasing human population, increasing crowd, increasing competition in the world force human being to cut the forests and establish well developed cities or farms or land for harvesting. In such a competitive world, every nation want to overlap other developed and advanced countries to go ahead and make them powerful. People are in need to cut the forests to make houses, parks, multiplexes, industries, public infrastructure, paper production, fuel, etc. Some greedy people are cutting forests for earning more money by selling woods and increasing the danger to the wildlife and human life. Wild animals are migrating and dying, original flora and fauna are lasting, environment is changing negatively and disturbing the human life.
of trees on a vast level for fulfilling all the requirements of the growing population. Humans being are so selfish; they are doing deforestation by completely removing the forests without replanting. However, they do not know that unknowingly they are digging a big pit for their own. People are changing the forests into the land forms for getting more wood, fuel, harvesting, making farms, building home and cities to live comfortably. Deforestation results in many effects like loss of animal home, animals are dying, environment change, seasonal change, increasing temperature, rising environmental heat, global warming, increasing green house gas effect, melting ice caps and glaciers, increasing seas level, weakening ozone layer, hole in the ozone layer. Forests plays great role in balancing the human life and environmental cycle by regulating the water cycle, production of soil, providing habitat for animals, providing oxygen, utilizing harmful CO2, regulating environmental temperature, preventing soil erosion and many more.
Woods have been of great importance historically from the ancient time and paper used for many purposes like heating fuel, building houses, ships, paper production and many more daily activities of the human beings. Forests are very necessary for us and our future generations to enjoy and live a healthy and peaceful life in the healthy environment free of pollution. Deforestation Essay 2 (150 words deforestation is arising as the major global problem to the society and environment. It is like a serious penalty to the planet and indicating the end of life on this planet. The regular cutting of the forests is creating lots of negative effects over the climate, environment, biodiversity, whole atmosphere as well as threatening the cultural and physical survival of the human being. There are many causes of the deforestation such as wood extraction because of the increasing human population and industrial interests of people. Woods are considered as the primary product of the forest and structural component of the physical requirement of the human being. Exploding human population requires more land to live and harvesting so they need to cut the forests. In this way deforestation is going on more rapidly to fulfill the human needs in many ways.
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Deforestation is the promotion cutting of trees permanently by the people to clear forests to get free land for further usage like farming, housing, industrialization, urbanization, etc. Deforestation is arising as the main environmental and social issue which has now taken the form of more than a powerful demon. We must know about the causes, effects and ways to solve the problems arisen because of the deforestation. We have provided many paragraphs, long and short essay on deforestation in order to help your kids and children to get aware about the problem as well as get participated in the essay writing competition in the school or outside the school. You can select any deforestation essay given below according to the class standard: Deforestation Essay 1 (100 words deforestation is the removal of forests on a big level by cutting down plants or burning of forests for fulfilling the personal needs. Forests are of great importance for the whole human fraternity as well as managing the natural balance in the environment. However, human beings are regularly cutting down the trees without seeing its side effects on the society and environment.