As the river approaches the sea, the speed of the flowing water decreases, and the river begins to break up into several streams known as distributaries. Question  1. Flow of water in a channel. Question  1. Tick the correct answer: (a) Flood plain Plate tectonics is the theory that Earth’s outer shell is divided into several plates that glide over the mantle, the rocky inner layer above the core. Beaches are formed when the sea waves deposit sediments along the shores. Answer: Nile, Zaire, Ganga-Brahmaputra, Hwangotto, Murray-Darling, Amazon, etc. During an earthquake, we should shift to some safe spot. In deserts, we often notice rocks in the shape of a mushroom, known as mushroom rocks. Imp.] The movement of the plates causes changes on the surface of the earth. Question  9.  Explain the work of a river. 2 Using a well-labelled diagram, explain why tectonic plates move. - Transform plate boundaries are typically lesser than the other two, and are found both on oceans, such as the Scotia and South American Plate, and on land, such as the Anatolian and Eurasian plate. Answer: Weathering and erosion. When the mantle pushes the edges of a tectonic plate higher, gravity can pull downward on it, causing the plate to move. Question  5. The question of how tectonic plates are moved around the globe is answered by understanding mantle convection cells. are solved by group of students and teacher of Class 9, which is also the largest student community of Class 9. The raised banks are called levees. MCQ Questions for Class 7 Social Science with Answers were prepared based on the latest exam pattern. Question  5. Most buildings are not built/made earthquake-proof. This lesson takes you deep into the earth to introduce the concept of plate tectonics and how this theory plays such an important part in the world of geology. (a) Deserts We should stay away from fireplaces, areas around chimneys, windows that shelter including mirrors and picture frames. Endogenic Forces. That is a basic fact of plate tectonics. This is because of the movement of the molten magma inside the earth. Q13. Before the rift, Eastern Europe and Africa were connected. Sometimes, the river overflows its banks causing flood in the neighboring areas. We have Provided Human Environment: Settlement, Transport and Communication Class 7 Geography MCQs Questions with Answers to help students understand the concept very well.  Define focus’ and ‘epicentre’. Some of the deepest parts of the oceans are these trenches. Hence, the cut-off lake is called ox-bow lake. [V. They tear apart due to shallow foundation, sub-standard interior material, and lack of adequate steel. Give an account of the work of wind. 4. Imp.] (ii) Earth’s movements are divided on the basis of the forces which cause them. (b) Beach NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12. Some move at about the speed your fingernails grow, some much faster. The sinking oceanic lithosphere drags the rest of the tectonic plate: this is the main cause of plate motion. Crescent-shaped lake formed by a meandering river. Stike-slip faults are vertical (or nearly vertical) fractures where the blocks have mostly moved horizontally. Steep perpendicular face of rock along a sea coast. When two plates coming towards each other collide or burst pass, they are known as transform plate.  What is a seismograph? The press of new magma material pushes the newly formed plates apart. When two plates come together, they are known as convergent plates. Q14. When the river tumbles at a steep angle over very hard rocks or down a deep valley side it forms a waterfall. When the earthquakes strike, the buildings are not capable of resisting the. As the plate moves down into the asthenosphere it begins to melt. [V. Exogenic forces are those forces which act on the surface of the earth and cause, Endogenic forces are those forces which originate in the interior of the earth and. In due course of time the meander loop cuts off from the river and forms a cut-off lake, which is also called an ox-bow lake. How fast do the tectonic plates move in relation to each other? (c) Deserts. 11. Moving mass of ice. The hot material reaches the base of the lithosphere where it cools and … Convection currents also occur within the atmosphere through wind and within the hydrosphere through ocean currents. How are beaches formed? The main driving force of plate tectonics is gravity. Answer the following questions briefly: Question 2. While entering the plain the river twists and turns and forms large bends which are known as meanders. The crust is made out of plates. The movement of plates causes volcanic eruptions, earthquakes, formation of mountains, etc. 15. What does the process of erosion and deposition create? [Imp.] (a) Glaciers Examples: Weathering, gradation, erosion, deposition. This creates plate motion and is the main cause of plate motion in the world. Glaciers carve out deep hollows. Ans. 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The collection of sediments from all the mouths forms a delta, which is a triangular landmass. Exogenic Forces. PLAY. What is a volcano? As the ice melts they get filled up with water and become beautiful lakes in the mountains. Plate Tectonics DO CONTINENTS MOVE? 357K. When the wind stops blowing the sand falls and gets deposited in low hill-like structures. Can be defined as mass per volume of a material. Question  4. After the flood has receded, a layer of fine material and other material is deposited over the plain in the form of sediments. In course of time the roofs of the caves also come down due to erosion and the arms/walls of the caves remain standing like pillars. These deposits form glacial moraines. The ones that work on the Earth’s surface are called exogenic forces while the ones that work in the Earth’s interior are called endogenic forces. Loop like the bend of a river. Answer: When the lithospheric plates move, the surface of the earth vibrates and then these vibrations travel outwards from the epicentre in the form of waves, which leads to sudden movement and results in the collapse of buildings. As it floods, it deposits layers of fine soil and other material called sediments along its banks. Small hill of sand caused by the action of the wind. Dry area where sand dunes are found. At the third type of boundary the plates move apart from each other. Answer:  A seismograph is a machine which measures an earthquake. When the wind blows, it lifts and transports sand from one place to another. Question  15. The sea waves strike the coasts and erode the soft rocks. Rise and fall of water caused by friction of the wind on the water surface. What is erosion? visudeva visudeva 21.06.2020 Geography Primary School Why do the plates move? The earth’s movements are divided based on the forces which cause them. 3. 13. This varies from plate to plate. Find out the names of a few rivers of the world that form a delta? How are glacial moraines formed? Read the ‘Earthquake – A case study’ given in the form of headlines that appeared in the newspapers after the quake. 12. Radioactive Decay. 9. These plates move very slowly across the surface of the Earth as though they were on a conveyor belt. Away from each other In a divergent boundary the magma from the mantle comes to the surface. Question  1. Answer: The process of erosion and deposition create different landforms on the surface of the earth. Why do the lithospheric plates move slowly? Solid form of water. Solve the crossword puzzle with the help of given clues. The earth’s tectonic plates are all constantly on the move. the process by which an unstable nucleus of an atom gives off energy. Some move at about the speed your fingernails grow, some much faster. Observe the photographs given below. Name the two processes which wear away the landscape. Thermal Convection. 1. Ans. 10. Plates move because of gravity, which is the main driving force behind plate tectonics. Erosion is the wearing away of the landscape by different agents like water, wind and ice. Imagine if a quake suddenly shook in the middle of the school day, where do you go for safety? Larger faults are mostly from action occuring in earth's plates. These are various features made by a river. Question  12. Find an answer to your question why do the plates move? 13. There are so many earthquakes and volcanoes at the edges of the Pacific Plate that this region is called the Ring of Fire. When two plates move far away from each other, they are known as divergent plates. Imp.] Gravity moves plates because when a plate meets another plate in the oceanic lithosphere, the dense oceanic lithosphere will dive beneath the other plate and sink into the mantle while dragging the rest of the tectonic plate. The material carried by the glacier such as rocks big and small, sand and silt gets deposited. One plate will move to the right and one plate will move to the left forming a 180 degree line [6 ] 2 marks max for diagram; 4 marks max for written explanation 3. Answer: The place in the crust where the movement starts is called the ‘focus’. All of those? (b) Beach 6. In the mantle hot material rises towards the lithosphere (like hot air rising out of an open oven - ever opened an oven door and felt the blast of hot air coming past your face?). • These pillars-like formations are termed as stacks. Volcanoes erupt when molten rock called magma rises to the surface. How do the lithospheric plates move? Answer: An earthquake of 7.0 magnitude is classified as a major earthquake. These deposits form glacial moraines. STUDY. When the grains are very fine and light, the wind can carry it over long distances. Question  10. The vibrations can travel all around the earth.  Name the scale on which the magnitude of the earthquake is measured. Answer:  When the lithospheric plates move, the surface of the earth vibrates. (a) Volcano (v) Ox bow lakes are found In Another explanation for plate movement is ridge push. The Meaning of Alphanumeric & Some Common Examples of Alphanumeric Code. How concentrated the mass (atoms and molecules) in an object or material is. CBSE > Class 07 > Social Science 2 answers; Sabibaa Bhanu 2 years, 5 months ago. Plates move because of gravity, which is the main driving force behind plate tectonics. Embankment on a river that keeps it in its channel. The aesthenosphere, at depths of approximately 70-250 kilometers, is the area of the inner Earth's magma where heat is generated to build the convection current. (iv) Mushroom rocks are found In Question  2. Some common earthquake prediction methods include studying animal behaviour, fish in the ponds get agitated, snakes come to the surface. How fast do the tectonic plates move in relation to each other? (i)  Which is not an erosional feature of sea waves? (i) The Lithospheric plates move around because of the movement of the molten magma inside the Earth. (c) Sea cave. Why do the plates move? First, they looked at the continents. Question  8. We should hide under a kitchen counter, table, or desk against an inside comer or wall. Imp.] Question 6. Q11. This is also the process that creates mid-ocean ridges. (ii) The depositional feature of a glacier is 14. Isolated mass of rising steep rock near a coastline. A fault line is the trace of a fault, or the line of intersection between the fault line and the earth's surface. The Questions and Answers of Describe three types of movement of plate? Melting may happen where tectonic plates are pulling apart or where one plate … Due to continuous erosion and deposition along the sides of the meander, the ends of the meander loop come closer and closer. (c) Glaciers. Answer: Plates move due to the movement in the molten magma found in the interior of the earth. Life After COVID-19: Reflecting on How the Pandemic Changed Schools & Education in Lasting Ways, Here's How to the Stop Emerald Ash Borer (EAB) Before This Invasive Pest Destroys More Forests. Scientific Evidence How do we back up these ideas? When they do, the melted rock beneath the plates rises up. This varies from plate to plate. They are made of the silt and other material brought by floods. The place where they meet has a crack or a trench. The Earth's tectonic plates do not move on top of the crust, they are the crust. Name of some rivers (See the Map): Question  1.  What do you know about the lithospheric plates? would keep pillow or cushion on our heads. In this lesson, we explore the causes of plate movement, including thermal convection, ridge push and slab pull.            [V. Question  2. Flat plain formed by river deposits during the time of the flood. Answer:  They move around very slowly, just a few millimeters each year. 2. Answer:  A volcano is a vent or opening in the earth’s crust through which molten material erupts suddenly. These vibrations are called earthquakes. Question 1. Answer:  Wind is an active agent of erosion and deposition in the deserts. Moreover, we should spread awareness amongst our friends and family members. How many directions can tectonic plates move? Answer:  Glaciers are rivers of ice that erode the landscape by destroying soil and stones to expose the solid rock below. The place on the surface above the focus is called the ‘epicentre’. Fine sand deposited by the action of the wind. Hard rocks remain uneroded. Convection cells are also responsible for the breaking up of supercontinents throughout Earth's history and were responsible for the East-African Rift. The molten magma inside the … The convection currents in the much hotter mantle continually move the plates about 1/2 to 4 inches per year. Therefore, such rocks have a narrower base and a wider top. They collapse and fall down like a pack of papers/cards. What Are Alphanumeric Characters? Answer: Question  6. Each distributary forms its own mouth. Due to spread of the new silt, the flood plains are fertile areas. Answer. This is known as what? Answer: The earth’s crust consists of several large and some small, rigid, irregularly— shaped plates, Le., slabs which cany continents and the ocean floor.  Give an account of earthquake preparedness. Question  14. Answer:  Earthquake is a natural calamity which we cannot stop. It is a triangular-shaped landmass. (b) River valleys Plates move because the the crust is in a higher elevation, therefore the crust is on top of the oceanic crust so that is why plates move.                              [V. Earthquakes and volcanoes often happen along plate boundaries. Earthquakes, volcanoes, tides? Winds erode the lower section of the rock more than the upper part. This leads to the formation of the flood plain. Alluvial tracts of land formed by the river deposits at the mouth of a river. What is an earthquake? This melted rock, or magma, cools as it rises and forms new crust. Which earthquake is classified as a major earthquake? The answer is plate tectonics! 7. Answer: The lithospheric plates move slowly because of the slow movement of molten magma inside the earth in a circular manner. Exogenic forces are those forces which act on the surface of the earth and cause. In course of time the rocks take up the shape of a mushroom. When the plates move they collide or spread apart allowing the very hot molten material called lava to escape from the mantle. Mention the work of ice. The forces that work on the earth’s surface are called exogenic forces while those that work in … You are learning that Earth is a dynamic planet: it is constantly changing. During rains rivers overflow their banks. What are some common earthquake prediction methods?[V. 5. But we can minimise its impact if we are prepared before-hand. As a result—a fertile floodplain is formed. Life After COVID-19: How Has Public Transit Changed as a Result of the Pandemic? The plates float on top of the mantle, which is made of molten rock, called magma. 8. 14. I n previous chapters, you learned about Earth’s size and shape,the materials of which it is made,and how heat energy causes Earth’s crust to move. (iii) Which is caused by the sudden movements of the Earth ? Then a time comes when the river becomes very slow and it begins to deposit its load. Across Answer. Scientists have traveled all over the Earth and found evidence that supports the ideas of plate tectonics. [Imp.] Imp.] Question  3. It is in the geosphere where they occur as plate tectonics. When’ rocks fall in the course of running dust-storms, the suspended particles of sand strike the lower portion of the rocks and erode them. Plates move due to the movement in the molten magma found in the interior of the earth. 16. Another reason why plates move is due to convection. Large body of seawater. Identify them and also tell whether they are erosional or depositional or landforms formed by both. Answer: (i) – (a), (ii) – (c), (iii)-(a) , (iv) -(a), (v)-(b). Question  2. Arrange the events in the right sequence of their happening. Q12. 2. Plates move due to the vibration of the earth 0 Thank You. This leads to the flooding of the nearby areas. Another reason why plates move is due to convection. This strong outer layer is called the lithosphere. Natural cavity on weak rocks formed by action of waves. Imp.] Answer: Victoria Falls is located on the borders of Zambia and Zimbabwe in Africa. (c) Moraine. If the answer is not available please wait for a while and a community member will probably answer this soon. When the meander loop is cut-off from the main river, it forms a cut-off lake. Newly-formed plates at oceanic ridges (constructive plate margins) are warm, and so have a higher elevation at the oceanic ridge than the colder, more dense plate material further away; gravity causes the higher plate at the ridge to push away causing the plates to move away from each other.
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