As the river enters into the plains, all of sudden the speed of flow of water is reduced to a greater extent and the river widens. (iv) water, air and plants. Soil erosion is defined as the removal of soil (particularly the top soil) by agents such as wind or running water. It contains air. Due to the load of sediments the river is carrying and because of the flat land, it is forced to deposit the sediments near the mouth. Note: You can't click Turn in until you enter an answer. Over time they become larger and wider. Cracks develop. The deposition of sediments in the deltas is a continuous process making these deltas the most fertile areas. These pieces of the earth's crust are called tectonic plates. Write a short (1-2 page) written piece in which you a) summarize the article, giving the who/what/where/when, and b) Explain the erosion and/or deposition, using scientific concepts from your work during the unit. This degrades the soil and results in desertification. Question 2: The water holding capacity is the highest in. (a) ''U' shaped valley                     (b) Lakes                       (c) Glacial Moraines. Q. The river starts breaking into number of small streams known distributaries. What is volcano? Mt. If the proportion of fine particles is relatively higher, then it is called clayey soil. (d) Sea Cliff: The steep rocky coast rising almost vertically above sea water is called sea cliff. The information was very interesting and useful. Answer: The erosion and deposition by water in the form of sea waves leads to the formation of coastal landforms. What are the main agents of erosion? This document is highly rated by Class 7 students and has been viewed 10764 times. ", Thankue sir for giving these questions thanks, Very very good answer thankue sirððððððð, Thanks sir its really help me to find question, Very much helpful bro and extra knowledge source for exams bro. Meanders are formed by the rivers in plains. Question 3. Answer: Clouds bring rain which is vital for survival of living beings. Question 2. Define: (a) Endogenic Forces (b) Exogenic Forces (c) Lithospheric PlatesAns 1:(a) Endogenic Forces: Forces which are working in the interior of the earth leading to earth movements, earthquakes and volcanic eruption are known as endogenic forces. The better the humus content in ⦠The river starts breaking into number of small streams known distributaries. Why? (b) Sea Arches: When these cavities become bigger and bigger only the roof of the caves remain, thus forming sea arches. (b) U-Shaped Valley: Formation of "U" shaped valleys, which are deep and have steep sides. (b) Dormant Volcanoes: These are also known as 'Sleeping Volcanoes'. Soil erosion is a continuous process that occurs either slowly or at an alarming rate. What is yeast? There are several challenges to resist soil erosion, but there are solutions to prevent it as well. Ans 14: Rivers are the most important agents of degradation. Q1. Give a detailed account of the features formed by Wind, Waves and Ice.Ans 8: The features formed by wind are as follows:(a) Mushroom Rocks: In deserts you can see rocks in the shape of a mushroom, commonly called mushroom rocks. Ans : If soil contains greater proportion of big particles it is called sandy soil. She put a fan at one end and turned the fan on. Sunderbans delta formed by the Ganga â Brahmputra river is the biggest delta and also is very fertile. The network of distributaries form a triangular shaped feature called delta. Broadly, there are seven major plates: African Plate, Antarctic Plate, Eurasian Plate, Indo-Australian Plate, North American Plate, Pacific Plate and South American Plate.According to the theory of continental drift, these tectonic plates are constantly moving. Why do they cause tremors?Ans 9: The crust of the earth is not in the form of a continuous plate rather in the form of broken pieces. (i) sandy soil. (d) Sea Cliff: The steep rocky coast rising almost vertically above sea water is called sea cliff. When these plates collide with each other, tremors or earthquakes are caused. What are meanders?Ans 4: Curves and large bends or loops formed by rivers in the plains are known as meanders. How does the process of gradation creates various landforms? Answer: The forces which act in the interior of the earth are known as endogenic forces and the forces which works on the surface of the earth are known as exogenic forces. Answer: Soil is formed by weathering of rocks.Weathering is the break down of rocks by the action of air, wind and water. Write a short note on Waterfall. What is soil erosion? Q40. Add mulch and rocks to prevent the plants and grass underneath to prevent soil erosion. Vesuvius in Italy. cause changes on the surface of the earth. (iii) minerals, organic matter, air and water. The dust particles merge in the air, resulting in air pollution. Click the class. These are very short answers so I liked it. What is their use? Q10. The grazing animals feed on the grasses and remove the vegetation from the land. Erosional process lowers the surface. What are tectonic plates? In a wide area with barren land the wind blows with great velocity creating new features specially in the deserts. Deposition: Rebuilding of earthâs surface is called deposition. They erupt after a very long time. Following are the important causes of soil erosion: Higher intensity of rainstorm is the main cause of soil erosion. If asked to confirm, click Turn in. Also, the tyres of tractors make grooves on the land, making a natural pathway for water. Question 1: In addition to the rock particles, the soil contains. The accumulation of soil sediments in dams and along the banks can reduce their efficiency. Soil Erosion. (b) Exogenic Forces: Forces which are working on the surface of the earth leading to the erosional and depotional features of wind, water and ice are known as exogenic forces. Rill Erosion. River contains water which is in liquid form and Glaciers contain ice which is in solid/semi-liquid for, due to which the features formed are different. (i) River breakup into various streams called 'distributaries'. When such sand is deposited in large areas, it is called loess. The course of a river is very large in compression to that of a glacier (river of ice). In the deserts we don't find lot of vegetation due to which the wind flows without any disturbance or obstruction. Wind action is prominent in desert area. Following are some of the methods of soil erosion prevention: The health of the soil is of utmost importance to the farmers and the population that depends upon agriculture for food and employment. Aggradation and degradation are the two main ways which as continuously at work creating different landforms on the earth surface. Volcanoes are classified into three types: Q3. Rill erosion is erosion that results in small, short-lived and well-defined streams. The process of reduction of height of landform is called 'degradation'. (iii) What is erosion? Answer: It is a process in which the top fertile layer of soil is lost. In this process, the soil particles are loosened or washed away in the valleys, oceans, rivers, streams or far away lands. During dry weather or in the semi-arid regions, the minute soil particles are carried away by the wind to faraway lands. An active agent of erosion and deposition in the deserts is wind. The trees are cleared and the land is ploughed to sow new seeds. How are features formed by a river different from that formed by a river of Ice?Ans 10: The features formed by a river are as follows:(a) 'I' & 'V' shaped valley                             (b) Gorges or Canyons (deep valleys)(c) Waterfalls, etc.                                        (d) Meanders (curves & large bends or loops)(e) Oxbow Lakes                                         (f) Flood Plains(g) Levees (slightly raised river banks)           (h) Delta(i) River breakup into various streams called 'distributaries'. Give a detailed account of the features formed by Wind, Waves and Ice. ⦠(b) Sand Dunes: When the wind blows, it lifts and transports sand from one place to another. Farming, grazing, mining, construction and recreational activities are some of the causes of soil erosion. The answer to all these questions is EROSION! (Optional) To add a class comment, click Add class comment.Enter your comment click Post . Whereas, course of a glacier is confined to the mountains only. Key Features of NCERT Solutions for Class 7 Science Chapter 9 The main agents of erosion are water, wind and ice. Question 1. May 09, 2021 - Very Short Question Answers - On Equality Class 7 Notes | EduRev is made by best teachers of Class 7. Erosion is the wearing away of the landscape by different agents like running water, glacier, wind, ground water and sea waves. Q6. Running water, moving ice, wind and waves are the main agents of gradation which continuously wear down the land surface and carry the broken fragments which are deposited in the low lying areas. Wind acts as an agent of erosion and deposition which leads to the formations of different features.In the deserts we don't find lot of vegetation due to which the wind flows without any disturbance or obstruction. These deltas are most fertile areas in the course of a river. Over time they become larger and wider. Answer: Erosion: Wearing down of the earthâs surface is called erosion. Define: (a) Endogenic Forces (b) Exogenic Forces (c) Lithospheric Plates. It is the natural process of wearing away of the topsoil, but human activities have accelerated the process. This leads to the flooding of the neighbouring areas. In a wide area with barren land the wind blows with great velocity creating new features specially in the deserts. Question 4. The sand was blown to the opposite side of the box and collected at that side. Four types of soil erosion are caused by rainfall: The raindrops disperse the soil, which is then washed away into the nearby streams and rivers. Answer: Erosion is defined as the wearing away of the landscape by different agents like water, wind and ice. Thus, hollow like caves are formed on the rocks. Question 1. The effects of soil erosion are not just land degradation. Due to the load of sediments the river is carrying and because of the flat land, it is forced to deposit the sediments near the mouth. Also, because of the lack of vegetation there is no moisture content in the soil and it is not able to hold itself and becomes very loose (sand). The sediments accumulate in the water and raise the water levels resulting in flooding. Q8. it helped me a lot for exams. A plateau is a flat area of land that is elevated above sea level. Q14. They are called sea caves. Q14. Name the erosional and depositional features found in coastal areas Explain how they are formed. Below you will find a "general outline of the activity: This quick formative assessment is a great way to see how much your students know how weathering, erosion and deposition. As the river enters into the plains, all of sudden the speed of flow of water is reduced to a greater extent and the river widens. Meanders are formed by the rivers in plains. The deposition of sediments in the deltas is a continuous process making these deltas the most fertile areas. Erosion of soil is more severe in areas of little or no surface vegetation, such as desert or bare lands. The features formed by ice are as follows:(a) Lakes: Glaciers carve out deep hollows. Answer: Soil erosion is the washing or blowing away (by wind or water) of the top layer of soil. Mining activities also disturb the land and leave the soil more prone to erosion. The flowing water during floods also erodes a lot of soil by creating potholes, rock-cut basins, etc. Q4. Respiration in Organisms Class 7 Extra Questions Short Answer Type 1. How does the process of gradation creates various landforms?Ans 6: The surface of the earth is continuously undergoing changes. Plant roots firmly bind the soil. The agricultural soil contains pesticides, insecticides, fertilizers, and several other chemicals. According to the theory of continental drift, these tectonic plates are constantly moving. Ans: A non-living organic matter formed from remains of dead and decay plants and animal by the activity of microorganism present in soil. Features like sand dunes, Mashroom rocks, etc. The process of depositing the eroded material is called 'aggradation'. They have been inactive since a very long time. Q3. Q13. When it stops blowing the sand falls and gets deposited in low hill â like structures. Sunderbans delta formed by the Ganga â Brahmputra river is the biggest delta and also is very fertile. When it rains, instead of rain carrying away the soil nutrients and plants down the slope, they flow to the next terrace. Ans 13: Wind action can be best seen in the desert areas. It is usually caused due to the removal of vegetation, or any activity that renders the ground dry. Ans: A river when approaches towards its last stage of its course before submerging into the seas and oceans becomes very slow. Ans 5: The process of depositing the eroded material is called aggradation. This layer is rich in the essential nutrients required by the plants and the soil. Speed and force of water is great, during this course river does lots of erosional work. As the river flows from the mountainous regions, it has great erosive power. They are called anaerobes. These walls like features are called stacks. Put a series of fibre logs to prevent any water or soil from washing away. To know more about soil erosion, its definition, causes, effects and prevention measures, keep visiting the BYJUâS website or download the BYJUâS app for further reference. Soil erosion is more severe in places with no surface vegetation, like bare lands or deserts. These deposits form glacial moraines. Etna in Italy. Thank You. Q9. Exercise 9.7 total Solutions: 13 Questions (10 short questions and 3 long questions). It could be about an event or a landform, or change to the landscape produced by either or both processes. What are tectonic plates? Why?Ans 13: Wind action can be best seen in the desert areas. In the plains river forms curves and large bends or loops called the meanders. Winds erode the lower section of the rock more than the upper part. Mt. Endogenic forces are those forces which originate in the interior of the earth and. Answer: Agents of erosion and deposition: Running water (river) Ice; Wind. The process of depositing the eroded material is called 'aggradation'. Most of the soil is eroded during winters. (c) Lithospheric Plates: The crust of the earth is broken into a number of large and small plates known as the lithospheric plates. Also Read: Difference between erosion and weathering. These walls like features are called stacks. Therefore, such rocks have narrower base and wider top. Q7. Answer: The removal of top soil by the action of water and wind is called soil erosion. In the plains river forms curves and large bends or loops called the meanders, Q1. A river flows from mountains, plains and forms various features before submerging into the sea. How are features formed by a river different from that formed by a river of Ice? If the amount of large and fine particles is about the same, then the soil is called loamy. E.g. NCERT Textbook Answers of class 7 science chapter 9 Soil, CBSE Class 7 Science Notes , Question Answers provided for NCERT Science Textbook for Class 7, Class 7 Science Chapter 9 Soil Exercises Answers, ... Ans. Answer: There are some organisms such as yeast that can survive in the absence of air. Features like sand dunes, Mashroom rocks, etc. ; Under Your answer, enter your answer click Turn in. It has led to a drastic increase in pollution and sedimentation in rivers that clogs the water bodies resulting in a decline in the population of aquatic organisms. Kilimanjaro in East Africa. 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Your teacher filled a box with sand. Why? Long Answer Questions Generally, there is a balance between the two. Hence, we should always discourage deforestation and cutting of trees, to save our soil resources. A wall at the base of the slope can help in preventing the soil from eroding. Question 1. (Optional) To add a private comment ⦠Degraded lands lose the water holding capacity resulting in floods. The top layer of soil is very light which is easily carried away by wind and water. Students will have the opportunities to read facts and categorize them as being representative of weathering, erosion, or deposition. The dust plumes from the arid and semi-arid regions cause widespread pollution when the winds move. (b) Sea Arches: When these cavities become bigger and bigger only the roof of the caves remain, thus forming sea arches. (ii) clayey soil. NCERT Solutions for Class 7 Social Science Geography Our Changing Earth book solutions are available in PDF format for free download. Q10. These are called sand dunes. todays paper was very easy sir . The process of erosion and deposition creates different land-forms on the surface of the earth. When these plates collide with each other, tremors or earthquakes are caused. How does the eye of a cyclone harm us? The depotional features formed by sea waves in the coastal areas are as follows: -. So it can be moved by wind and flowing water. These include; sea caves, sea arches, sea cliff and beaches. Farming, grazing, mining, construction and recreational activities are some of the causes of soil erosion. (c) Stacks: Further, erosion breaks the roof and only walls are left. These include; sea caves, sea arches, sea cliff and beaches. Q5. In deserts we see rocks in the shape of a mushroom, commonly called mushroom rocks. Answer: Following are the four important properties of soil: It absorbs water. These ncert book chapter wise questions and answers are very helpful for CBSE exam. Regions with very heavy and frequent rainfall face a large amount of soil loss. It results in a continuous loss of topsoil, ecological degradation, soil collapse, etc. It allows water to percolate. (i) air and water. E.g. Broadly, there are seven major plates: African Plate, Antarctic Plate, Eurasian Plate, Indo-Australian Plate, North American Plate, Pacific Plate and South American Plate. The leaf litter that protects the soil from erosion, is also lost during logging. Wind acts as an agent of erosion and deposition which leads to the formations of different features. Let us have a detailed look at the causes, effects and prevention of soil erosion.
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