Maharashtra State BoardHSC Arts 11th
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Balbharati solutions for Geography 11th Standard Maharashtra State Board chapter 1 - Earth Movements [Latest edition]

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Chapters

Geography 11th Standard Maharashtra State Board - Shaalaa.com

Chapter 1: Earth Movements

Let’s recall.Think about it.Try this.Can you tell?Give it a try.Find out !Exercise
Let’s recall. [Pages 1 - 6]

Balbharati solutions for Geography 11th Standard Maharashtra State Board Chapter 1 Earth Movements Let’s recall. [Pages 1 - 6]

Let’s recall. | Q 1 | Page 1

Observe the following pictures and discuss the questions in the class.

  1. What might be the reasons behind buildings collapsing in photo 1?
  2. Which event is depicted in photo 2? What impact does it bring about in the surroundings?
  3. In photo 3, what could be the reason behind the bend in the rock strata?
  4. What could be the reason behind the difference in altitudes of the land and the steepness of the slope in photo 4?
  5. Classify the events in the photos into sudden and slow movements.
  6. Example of which of these movements is not likely to be found in the mainland of the Indian sub-continent?
Let’s recall. | Q 2 | Page 6

On 19th August 2018, around 300 people died in Indonesia. Many buildings collapsed. Many roads broke apart. A tsunami was generated.

  1. What was the cause behind these events?
  2. What actually happened during this natural event?
  3. Name the energy waves involved in this natural event.
  4. Observe the diagram and label the boxes.
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Think about it. [Pages 3 - 7]

Balbharati solutions for Geography 11th Standard Maharashtra State Board Chapter 1 Earth Movements Think about it. [Pages 3 - 7]

Think about it. | Q 1 | Page 3

How will compressional forces affect brittle rocks?

Think about it. | Q 2 | Page 4

'A mountain never remains a mountain'. Can you relate this idiom with the mountain building process?

Think about it. | Q 3.1 | Page 6

When can faults form in fold mountains?

Think about it. | Q 3.2 | Page 6

Can folds form in block mountains? Find the reasons and discuss.

Think about it. | Q 4 | Page 6

Look at figure During an earthquake, do you think the seismic waves reach entire portion of the earth? Is there any region on the Earth's surface where a given earthquake will not be reported?


Shadow zone of an earthquake

Think about it. | Q 5 | Page 7

Why has a shadow zone for L-waves not been shown in the figure?


Shadow zone of an earthquake

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Try this. [Pages 4 - 5]

Balbharati solutions for Geography 11th Standard Maharashtra State Board Chapter 1 Earth Movements Try this. [Pages 4 - 5]

Try this. | Q 1 | Page 4

Observe the following diagrams. Try to understand the different types of fold shown in the diagram and match it with its characteristics. Write the name of the fold in the space given below.

A) Symmetrical:

  1. The axial plane is vertical.
  2. Limbs are inclined at same angle.

B) Asymmetrical:

  1. The axial plane is inclined.
  2. The limbs are inclined at different angles.

C) Overturned:

  1. One limb lies above the other limb.
  2. Limbs slope unequally in the same direction.

D) Recumbent:

  1. The axial plane is almost horizontal.
  2. One limb lies over the other in a horizontal direction.

E) Isoclinal:

  1. The limbs slope in the same direction with the same amount.
  2. The axial plane may be vertical, inclined, or horizontal.
  3. The slope of some portion of limbs is near vertical.
Try this. | Q 2 | Page 5

Observe the diagrams and read the explanation regarding the characteristics of various faults given below. Identify the faults and match each of them with their characteristics.

A) Normal fault: It results when a portion of land slides down along the fault plane and when the exposed portion of the plane faces the sky.

B) Reverse fault: It results when a portion of the land is thrown upward relative to other side of the land. In such situation, the fault plane faces the ground.

C) Tear fault: At times, the rock strata on either sides of the fault plane do not have vertical displacement. Instead, movement occurs along the plane in horizontal direction.

D) Thrust fault: When the portion of the land on one side of the fault plane gets detached and moves over land on the other side. The angle of fault plane is generally lowless than 45°.

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Can you tell? [Page 7]

Balbharati solutions for Geography 11th Standard Maharashtra State Board Chapter 1 Earth Movements Can you tell? [Page 7]

Can you tell? | Q 1 | Page 7

In Figures A, B, C is three points on the earth's surface. Analyse their locations with respect to epicenter and shadow zones

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Give it a try. [Page 8]

Balbharati solutions for Geography 11th Standard Maharashtra State Board Chapter 1 Earth Movements Give it a try. [Page 8]

Give it a try. | Q 1 | Page 8

How to locate epicentre of a given earthquake?

Take the given hypothetical data in the table. The data shows the time of arrival of P-waves and S-waves at 3 seismograph stations. Assume the scale of the map as 1 cm: 18 km. See figure.

Recording Station P-wave arrival time ( IST) S-wave arrival time
Jalana 11: 06: 06 11: 06: 19
Washim 11: 06: 46 11: 07: 03
Aurangabad 11: 07: 06 11: 07: 24

Procedure :

  1. Compute the time difference between the arrival of P-waves and S-waves for each station; this is called time lag. (It shows the distance of the seismograph from the focus. Thumb rule: For every second of time lag, the earthquake is approximately 8 km away.)
  2. Using the rule above, convert the time lag into the distance (seconds of time lag × 8) for each station.
  3. Convert this distance into centimetres as per the scale of the map.
  4. On a map, locate the seismograph stations.
  5. Draw circles, taking the seismograph stations as the centre, with the radius equal to the distance you have calculated in the previous step.
  6. These arcs of circles will intersect one another at a point. This point is the location of the epicentre.

    In normal practice, an epicentre is located using computer models. The procedure outlined here is a much simplified version of what is normally done, although the principle is the same.

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Find out ! [Page 9]

Balbharati solutions for Geography 11th Standard Maharashtra State Board Chapter 1 Earth Movements Find out ! [Page 9]

Find out ! | Q 1 | Page 9

Find out examples of active, dormant and extinct volcanoes.

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Exercise [Pages 13 - 14]

Balbharati solutions for Geography 11th Standard Maharashtra State Board Chapter 1 Earth Movements Exercise [Pages 13 - 14]

Exercise | Q 1 | Page 13

Complete the chain:

A B C
1) Widespread volcanic eruption 1) Zone V 1) I to XII
2) Andaman and Nicobar Islands 2) Fissure eruption 2) Block Mountain
3) Mercalli scale 3) Intensity 3) Very high seismic vulnerability
4) Slow movements 4) Faulting 4) Solid
5) Phillippines 5) Volcanic bombs 5) Deccan Trap
6) Volcanic material 6) Circum Pacific belt 6) Mayon
Exercise | Q 2.1 | Page 13

Identify the correct correlation:

A: Assertion; R: Reasoning

A: Faulting leads to the development of fold mountains.
R: Faulting occurs when tensional forces move away from each other.

  • Only A is correct

  • Only R is correct

  • Both A and R are correct and R is the correct explanation of A.

  • Both A and R are correct but R is not the correct explanation of A.

Exercise | Q 2.2 | Page 14

Identify the correct correlation :
A: Assertion; R: Reasoning

A: Intensity of an earthquake is a measurement of the energy released during an earthquake.
R: Mercallis scale is used to measure the intensity of an earthquake.

  • Only A is correct

  • Only R is correct

  • Both A and R are correct and R is the correct explanation of A.

  • Both A and R are correct but R is not the correct explanation of A.

Exercise | Q 2.3 | Page 14

Identify the correct correlation:
A: Assertion; R: Reasoning

A: South-East Asia, Japan, and islands in the Pacific Ocean are most vulnerable to earthquakes and volcanic eruptions.
R: They are located in the 'Ring of Fire'.

  • Only A is correct

  • Only R is correct

  • Both A and R are correct and R is the correct explanation of A

  • Both A and R are correct but R is not the correct explanation of A.

Exercise | Q 3 | Page 14

Identify the correct group:

    1. Symmetrical fold
    2. Isoclinal fold
    3. Overturned fold
    4. Recumbent fault
    1. Black Forest
    2. Vosges
    3. Himalayas
    4. Satpuras
    1. Narmada Valley
    2. African Valley
    3. Tapi Valley
    4. Rhine Valley
    1. Caldera
    2. Crater lake
    3. Cinder Cone
    4. Lava plateau
Exercise | Q 4.1 | Page 14

Give a geographical reason:

Extinct conical volcanoes often form crater lakes.

Exercise | Q 4.2 | Page 14

Give a geographical reason:

People living in the Himalayas are more vulnerable to earthquakes.

Exercise | Q 4.3 | Page 14

Give a geographical reason:

L-waves do not have a shadow zone.

Exercise | Q 4.4 | Page 14

Give a geographical reason:

Soft rocks form folds while hard rocks form faults.

Exercise | Q 4.5 | Page 14

Give a geographical reason:

Folds depend on the strength of rocks and the intensity of forces.

Exercise | Q 5.1 | Page 14

Answer in detail:

Explain different types of faults.

Exercise | Q 5.2 | Page 14

Answer in detail:

Explain with examples, different types of landforms produced by a volcanic eruption.

Exercise | Q 5.3 | Page 14

Answer in detail:

Explain the concept of the shadow zone.

Exercise | Q 5.4 | Page 14

Answer in detail:

Write a note on volcanic materials

Exercise | Q 6.1 | Page 14

Differentiate between Folding and faulting

Exercise | Q 6.2 | Page 14

Differentiate between Normal fault and Reverse fault

Exercise | Q 6.3 | Page 14

Differentiate between Syncline and Anticline

Exercise | Q 6.4 | Page 14

Differentiate between Asymmetrical fold and Symmetrical fold

Exercise | Q 6.5 | Page 14

Differentiate between Mercalli scale and Richter scale

Exercise | Q 6.6 | Page 14

Differentiate between Slow movements and sudden movements

Exercise | Q 7.1 | Page 14

Draw diagram of Types of folds

Exercise | Q 7.2 | Page 14

Draw diagram of Types of faults

Exercise | Q 7.3 | Page 14

Draw diagram of Shadow zone

Exercise | Q 7.4 | Page 14

Draw diagram for Volcanic landforms.

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Chapter 1: Earth Movements

Let’s recall.Think about it.Try this.Can you tell?Give it a try.Find out !Exercise
Geography 11th Standard Maharashtra State Board - Shaalaa.com

Balbharati solutions for Geography 11th Standard Maharashtra State Board chapter 1 - Earth Movements

Balbharati solutions for Geography 11th Standard Maharashtra State Board chapter 1 (Earth Movements) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the Maharashtra State Board Geography 11th Standard Maharashtra State Board solutions in a manner that help students grasp basic concepts better and faster.

Further, we at Shaalaa.com provide such solutions so that students can prepare for written exams. Balbharati textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.

Concepts covered in Geography 11th Standard Maharashtra State Board chapter 1 Earth Movements are Earth Movements, Evidences of Earth Movements, Slow Earth's Movements, Folding, Faulting, Sudden Movements, Earthquake, Volcanoes.

Using Balbharati 11th solutions Earth Movements exercise by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. The questions involved in Balbharati Solutions are important questions that can be asked in the final exam. Maximum students of Maharashtra State Board 11th prefer Balbharati Textbook Solutions to score more in exam.

Get the free view of chapter 1 Earth Movements 11th extra questions for Geography 11th Standard Maharashtra State Board and can use Shaalaa.com to keep it handy for your exam preparation

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