Balbharati Solutions Class 9 Geography Endogenetic Movements
Welcome to NCTB Solutions. Here with this post we are going to help 9th class students for the Solutions of Balbharati Class 9 Geography Text Book Chapter 2, Endogenetic Movements. Here students can easily find step by step solutions of all the questions in Endogenetic Movements. Also our Expert Geography Teacher’s solved all the question answer with easily understandable language with proper guidance so that all the students can understand easily. Here in this post students will get chapter 2 solutions. Here all the Question Answer are based on Balbharati latest syllabus. Here all the question and answer are based on Maharashtra State Board latest syllabus.
Endogenetic Movements Exercise question Solutions :
Question no – (1)
(a) Velocity are slow movements in the earth’s interior dependent.
(b) When waves divert from each other, they create Tension.
(c) For the formation of a rift valley, Tension processes should occur in the earth’s crust.
(d) The Himalayas is a fold mountain.
(e) The formation of extensive plateaus is a result of Continent-building movements.
Question no – (2)
(a) Buildings collapsed at the foothills of the Himalayas because of an earthquake. Before collapsing they were moving forward and backward.
Buildings collapsed at the foothills of the Himalayas because of an earthquake. Before collapsing they were moving forward and backward because of Secondary wave or ‘S’ wave. This waves can travel only through the solid medium.
(b) There is a difference in the formation of the Meghalaya Plateau and the Deccan Plateau.
The difference in the formation of the Meghalaya Plateau and the Deccan Plateau is that the Meghalaya Plateau is type of Block mountain and the Deccan Plateau is a Fissure type volcano.
(c) Most of the volcanoes are found on the plate boundaries.
Because the part of the plate boundary which slide under the crust subdues, most of the volcanoes are found on the plate boundaries.
(d) The Barren Island is becoming conical in shape
The Barren Island is becoming conical in shape because it ejects magma through a single central vent.
(e) Volcanic eruptions can cause earthquakes.
Volcanic eruptions can cause earthquakes because when the magma is coming out from a volcano a massive amount of energy is creating pressure on the earth’s tectonic plates.
Question no – (3)
(a) Tsunamis are generated in coastal areas
= Sudden movement.
(b) The Himalayas are an example of fold mountains.
= Slow movement Mountain building movement.
(c) Molten magma is thrown out of the earth’s mantle.
= Sudden movement.
(d) Rift valley is formed because of faulting.
= Slow movement Downward Upward movement.
Question no – (4)
Earthquake is a natural phenomenon, which creates sudden shake on the earth’s surface. It occurs suddenly through the following steps which are mentioned in chronological order –
(b) The plates suddenly move.
(e) Stored energy is released in the form of seismic waves.
(c) Due to the movements in the mantle, compression goes on increasing.
(a) The earth’s surface vibrates.
(d) Along the weak points (faultlines) rocks break apart.
Question no – (5)
(a) Difference between the Block Mountain and Fold Mountain are as follows :
- Block Mountain :
Block mountains are formed due to tension.
When the internal movements, horizontal waves moving away from each other a Block Mountains are formed.
Examples : The Meghalaya Plateau of India, Black Forest mountains in Europe.
- Fold Mountain :
Fold mountains are formed due to compression.
Due to the transferred energy from internal earth waves and pressure working towards each other and in horizontal direction, then the layers of the soft rocks are bends and creates Fold Mountain.
Examples : The Himalayas, The Alps, The Rockies, The Andes, The Aravali are the major fold mountains of the earth.
(b) Difference between the Primary and Secondary Seismic Waves are
- Primary Seismic Waves :
These waves can travel through all three states – liquid, solid and gaseous.
These waves change their direction while going through liquid medium.
Because of the primary waves the buildings on the earth’s surface move back and forth.
- Secondary Seismic Waves :
These waves can only travel through the solid medium.
These waves get absorbed when they enter the liquid medium.
Because of the secondary waves the buildings on the earth’s surface move up and down.
(c) Difference between the Earthquakes and volcanoes are as follows :
- Earthquakes :
No materials is ejected during earthquake.
Earthquakes are originated from deep inside the earth.
Earthquakes are difficult to predict.
- Volcanoes :
Ash, water vapour, various types of gases,hot molten magma is ejected during volcanic eruption.
Volcanoes are originated form where openings in the earth’s crust allows molten rock to escape on the earth’s surface.
Volcanoes are easier to predict.
Question no – (6)
(a) An earthquake occurs because of the movements in the interior of the earth, tremendous tension is created in earth’s crust, when the tension goes beyond limits the energy is released in the form of waves. For this result earth’s surface vibrates and earthquake occurs.
(b) Horizontal movement towards each other within the earth’s crust have led to the formation of the major fold mountains in the world.
(c) The magnitude of the earthquake related to the collapse of houses in the following manner, a graph is showing movement of seismic waves then, by studying the graph, the magnitude of the earthquake is known. Then with the help of Richter scale the magnitude of the earthquake is measured.
(d) The effects of earthquakes on the earth’s surface and human life’s are –
Sometime because of earthquakes the level of underground water decreases.
• Fractures and cracks develop on the earth’s surface.
• Tsunamis are generated on the ocean.
• Buildings collapsed with each other and we losses many of life’s, properties etc.
(e) There are three types of seismic waves –
Primary or ‘P’ waves,
Secondary or ‘S’ waves, and
Surface or ‘L’ waves.
(f) On the basis of periodicity of eruption there are three types of volcanoes
Examples : Mt. Fujiyama in Japan, Mt. Stromboli in Mediterranean Sea.
Examples : Mt. Vesuvius in Italy, Barren Island in India.
Examples : Mt. Kilimanjaro in Tanzania.
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