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Class 7 Geography Chapter 3 Question Answers - Our Changing Earth

Very Short Q & A :

Q1: The lithosphere is broken into number of plates known as…………………….

Ans : Lithospheric plate

Q2: The molten magma inside the earth moves in a circular manner.( T/F)

Ans : True

Q3: Define focus.

Ans : The place in the crust where the movement starts is called the focus.

Q4: Which of the following is not a part of earth quake waves-

1. S

2. P

3. L

4. T

Ans :  T

Q5: Which of the following machine is used to measure earthquake-

a. Richter scale

b. Seismograph

c. Sphygmomanometer

d. Anemometer

Ans :  Seismograph

Q6: ………………is used to measure magnitude of earth quake.

Ans : Richter scale

Q7: The highest water fall is…………………falls of Venezuela.

Ans : Angel

Q8: What is vent?

Ans : The narrow opening of a volcanoes is called vent.

Q9: Sudden movement in the earth interior are cause due to –

a. Exogenic force

b. Plutonic force

c. Endogenic force

d. None of these

Ans : Endogenic

Q10: The strength of the earth quake decreases away from the centre. (T/F)

Ans : True

Q11: Match the following –

Column 1 Column 2
  1. P waves-
  2. S wave
  3. L wave
  1. Surface wave
  2. Longitudinal wave
  3. Transverse wave

Ans :
  
1-b, 2-c, 3-a

Q12: A ………………is a vent in the earth crust through which molten material erupts suddenly.

Ans : Volcano

Q13: When the rivers began to break up into a number of streams called………………….

Ans : Distributaries

Q14: Which among the following is not the agent of weathering and erosion-

a. Wind

b. Water

c. Ice

d. Heat

Ans :  Heat

Q15: The depositional feature of a glacier is-

a. Moraine

b. Beach

c. Flood plain

Ans : Moraine

Q16: Focus lies just above the epicentre (T/F)

Ans : False

Q17: Severe earth quake calculated above the 5.0 magnitude. (T/F)

Ans : False

The document Class 7 Geography Chapter 3 Question Answers - Our Changing Earth is a part of the Class 7 Course Social Studies (SST) Class 7.
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FAQs on Class 7 Geography Chapter 3 Question Answers - Our Changing Earth

1. What are the major changes that our Earth undergoes?
Ans.The Earth undergoes various changes such as geological changes, climate changes, and human-induced changes. Geological changes include volcanic eruptions, earthquakes, and the creation of mountains and valleys. Climate changes refer to shifts in temperature and weather patterns, often influenced by natural events or human activities. Human-induced changes involve urbanization, deforestation, and pollution.
2. How do natural processes shape the Earth's surface?
Ans.Natural processes like erosion, weathering, and plate tectonics play a crucial role in shaping the Earth's surface. Erosion wears away rocks and soil, while weathering breaks down rocks into smaller pieces. Plate tectonics cause the movement of the Earth's crust, leading to the formation of mountains, earthquakes, and oceanic trenches.
3. What is the impact of human activities on the environment?
Ans.Human activities significantly impact the environment through pollution, deforestation, and climate change. Pollution contaminates air, water, and soil, harming ecosystems and human health. Deforestation leads to loss of biodiversity and disrupts habitats. Climate change, driven by greenhouse gas emissions, results in extreme weather patterns and rising sea levels.
4. How does the climate change affect the Earth?
Ans.Climate change affects the Earth by altering weather patterns, increasing the frequency of extreme weather events, and causing the melting of polar ice caps. These changes can lead to rising sea levels, affecting coastal communities, and can disrupt agriculture, leading to food insecurity and economic challenges.
5. What are the effects of earthquakes and volcanic eruptions on the Earth?
Ans.Earthquakes and volcanic eruptions can have devastating effects on the Earth. Earthquakes can cause ground shaking, leading to destruction of buildings and infrastructure, while also triggering landslides and tsunamis. Volcanic eruptions can result in lava flows, ash clouds, and pyroclastic flows, which can destroy landscapes and alter ecosystems.
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