Important Questions Class 7 Social Science Our Environment Chapter 3

Important Questions Class 7 Social Science Our Environment Chapter 3

The contemporary academic subject of geography originates in ancient practice and is concerned with the features of places, particularly their natural surroundings and populations and their interactions. The first people to invent and name it were the Greeks, who joined the terms “geo” and “graphein” to denote “earth writing” or “earth description” roughly 2,000 years ago. Class 7 Social Science, Our Environment is Our Changing Earth is the third chapter. Two forces that drive Earth’s motions are – Endogenic forces are those that operate in the Earth’s interior, while exogenic forces are those that operate on the planet’s surface. Volcanoes and earthquakes bring about large-scale damage to Earth’s surface. Two processes, weathering, and erosion, continually erode the landscape. Chapter 3 Class 7 Social Science Our Environment Important Questions helps grasp the chapter’s concepts. Students can easily access all this and more on the Extramarks website.

Geography is a subject that students can utilise in their future courses. Social Science Our Environment Class 7 Chapter 3 Important Questions are compiled by Extramarks experts using the NCERT Textbook, reference books, past exam papers, and other sources. Our Social Science specialists have created a list of step-by-step solutions to help students comprehend each chapter. Students can register with Extramarks and access Class 7 Social Science Our Environment Chapter 3 Important Questions. 

In addition to Important Questions Class 7 Social Science Our Environment Chapter 3, students can easily access materials like NCERT Solutions, CBSE revision notes, past year question papers, NCERT books, and more on the Extramarks website.

Important Questions Class 7 Social Science Our Environment Chapter 3- with Solutions

Social Science experts at Extramarks have developed an entire list of Important Questions Class 7 Social Science Our Environment Chapter 3 from plenty of sources. They are categorised using the forces that propel the movements of the Earth. Exogenic forces work upon the globe’s surface, whereas endogenic forces function within the body of the Earth. Volcanoes and earthquakes on the surface of the Earth do significant harm. The erosion of the landscape is a result of two processes: weathering and erosion. These questions and solutions help students better comprehend Our Changing Earth.

Mentioned below are a few Important Questions Class 7 Social Science Our Environment Chapter 3:

Question 1. What are oxbow lakes?

Answer 1. The river meanders through the plains, creating wide curves known as meanders. Over time, the meander loops begin to isolate the river and create lakes known as oxbow lakes.

Question 2. Explain the role of the wind.

Answer 2. In deserts, wind plays a significant role in erosion and deposition.

There are many rocks in deserts that resemble mushrooms.

• They are sometimes referred to as “mushroom rocks.”
• Winds erode the rock’s bottom portion more than its higher portion.
• Such rocks have a broader top and a narrower base.

Sand is lifted and moved from one location to another by the wind.

• Sand falls and is deposited in low, hill-like formations after the wind ceases.
• We refer to them as sand dunes.

Sand that is exceedingly fine and light gets carried over great distances by the wind.

• These sand deposits are known as loess when they occur in significant quantities. China is home to significant loess deposits.

Question 3. Why do the tectonic plates move?

Answer 3. The shifting of plates is caused by the flow of molten magma within the Earth.

Question 4. Summarise the role of ice.

Answer 4. 

• Glaciers are ice “rivers.”
• They also damage the terrain by bulldozing dirt and rocks to reveal the solid rock below.
• Glaciers carve out deep gorges.
• The mountains become the spot for magnificent lakes as the ice melts and are filled with water.
• Large and tiny pebbles, sand, and silt that the glacier transported are deposited.
• These leave from moraines formed by glaciers.

Question 5. How are beaches formed?

Answer 5. Along the seashores, silt is left behind by the waves. Beaches are created as a result of this.

Question 6. Make a note of how sea waves operate.

Answer 6. This is the role of sea waves:

• Coastal land formations are created by the sea waves’ erosion and deposition.
• The sea is always battering the cliffs.
• Cracks appear.
• Over time, they enlarge and spread out.
• On the rocks, hollow-like caverns have developed.
• They’re known as sea caves.
• As caverns grow larger and larger, just the roofs are left. Sea arches are created as a result.
• The roofs are destroyed by ongoing erosion, leaving just the walls.
• Stacks are the name for these wall-like structures.
• Sea cliff refers to the abruptly vertically rising rocky coastline.
• Along the coastlines, silt is left behind by the sea.
• Sea beaches eventually arise because of this.

Question 7. What are exogenic and endogenic forces?

Answer 7. There are many types of Earth motion that exist. These are based on the different factors that drive each type of Earth’s movement. Therefore, the forces that operate in the Earth’s interior are known as endogenic forces, whereas the forces that operate on the Earth’s surface are known as exogenic forces.

Question 8. What are the two processes that are destroying the landscape constantly? Describe them.

Answer 8. Two processes continually erode the landscape. They are:

• Erosion and weathering.
• On the surface of the Earth, rocks are broken up through weathering.
• Erosion is the process through which the terrain is worn away by various forces such as water, wind, and ice.
• The eroded material is moved or carried away using water, wind, etc.
• They ultimately leave behind stuff.
• On the surface of the planet, diverse landforms are produced by this process of erosion and deposition.

Question 9. What are sand dunes?

Answer 9. Sand is lifted and moved from one location to another by the wind. Sand falls and is deposited in the low, hill-like formations after the wind ceases. We refer to them as sand dunes. They are primarily located in arid regions.

Question 10. Describe earthquake preparedness.

Answer 10. In the event of an earthquake, the following actions should be taken:

• We should be in a secure location, such as behind a kitchen counter, a table, or a desk.
• We should lean against an inside wall or doorway.
• Avoiding spots near fireplaces, chimneys, and windows that break, including mirrors and picture frames, is advised.
• We can be better prepared by raising awareness among our friends and family.
• Any catastrophe should be met with knowledge and preparedness.

Question 11. What is erosion?

Answer 11. The definition of erosion is the wearing away of the terrain by various forces such as water, wind, and ice. On the Earth’s surface, erosion and deposition result in various land formations.

Question 12. What is a seismograph? How is an earthquake’s magnitude determined?

Answer 12. A machine is used to measure earthquakes. It’s known as a seismograph. The Richter scale is used to determine the earthquake’s magnitude.

• A 2.0 earthquake or smaller is seldom felt.
• When an earthquake is stronger than 5.0, objects fall and cause damage.
• A magnitude of 6.0 or above is regarded as extremely powerful, while a magnitude of 7.0 is considered deadly.

Question 13. How are flood plains formed?

Answer 13. A river that spills over its banks causes the surrounding region to flood. Sediments are a coating of fine soil and other materials left behind when it floods. Consequently, flood plains, a fertile layer of soil, were formed.

Question 14. Describe some popular earthquake prediction techniques used in your area.

Answer 14. The following are a few of the earthquake prediction techniques used locally:

• Wild animal conduct
• Fish in the ponds are agitated.
• Snakes emerge from their burrows to the surface.
• Animals attempt to free themselves from ties and flee.
• Leaving their nests, birds start chirping loudly.

Question 15. How do earthquakes occur? Define epicentre and focus.

Answer 15. Earthquake:

• The Earth’s surface vibrates when the lithosphere plates shift.
• The Earth’s vibrations are felt everywhere.
• We refer to these tremors as earthquakes.

Focus: Focus is the location or spot in the crust where the movement begins.

Epicentre:

• Epicentre refers to the area or surface above the focus.
• Wave-like vibrations radiate outward from the centre.
• Nearest to the epicentre is where the most damage happens.
• As you leave the earthquake’s epicentre, its intensity starts to decline.

Question 16. Summarise the role of a river.

Answer 16. 

• A river’s flowing water erodes the surrounding area.
• A waterfall develops when a river flows at a steep angle over extremely hard rocks or down a steep valley side.
• Rivers make sharp curves and wide bends as they hit the plain. Meanders are the name for these bends.

The ends of a meander loop are coming closer together due to constant erosion and deposition along the meander’s sides.

• The meander loop eventually separates from the river and creates a cut-off lake.
• This lake is known as an oxbow lake.
• The river occasionally exceeds its banks.
• This causes the surrounding areas to flood.
• Fine dirt and other materials are deposited in layers by the floodwater.
• Along the banks, they are referred to as sediments.
• As a result, a floodplain—a flat, productive area of land—is created.
• Levees are the elevated banks.

The flowing water’s pace slows as the river gets closer to the ocean.

• The river starts to divide into several streams. They are called distributaries.
• Now that the river is moving slowly, its cargo is being deposited.
• Every distributary creates a separate mouth.
• Accumulated sediments create the triangular-shaped land mass known as a delta from all the mouths.

The above-stated section of Important Questions Class 7 Social Science Our Environment Chapter 3 is a list of Important Questions covering the entire chapter.

Benefits of Solving Important Questions Class 7 Social Science Our Environment Chapter 3

Students are advised to go through Important Questions Class 7 Social Science Our Environment Chapter 3. For a subject such as a geography, students are frequently advised to go through this important question for better preparation for the exams. Students will get a sense of confidence by solving essential questions from all the chapters and overlooking their solutions.

Mentioned below are some benefits of solving Important Questions Class 7 Social Science Our Environment Chapter 3:

• Going through these solutions is quite essential for students, as these solutions help grasp the concepts and the writing pattern.
• The language used in compiling these solutions is simple and easy to understand.
• The experienced teachers and experts from Extramarks have gathered the most crucial information based on the NCERT guidelines.