Class 7 Geography Chapter 3 Practice Question Answers - Our Changing Earth

Q1. The place in the crust where the movement of the earth starts is called the:
(a) Focus
(b) Epicentre
(c) Point
(d) None of these
Ans: (a)

Q2. After the river enters the plain, it twists and turns forming large bends known as:
(a) Meanders
(b) Ox-bow lake
(c) Levees
(d) None of these
Ans: (a)

Q3. Large deposits of loess is found in:
(a) South Korea
(b) Malaysia
(c) China
(d) None of these
Ans: (c)

Q4. The highest waterfall of the world is:
(a) Niagara falls
(b) Angel falls
(c) Victoria falls
(d) None of these
Ans: (b)

Q5. Which waterfall is located on the border between Canada and USA in North America?
(a) Angel falls
(b) Niagara falls
(c) Victoria falls
(d) None of these
Ans: (b)

Q6. At what magnitude is earthquake classified as major earthquake?
(a) 2.0
(b) 5.5
(c) 7.0
(d) 6.5
Ans: (c)

Q7. Which is caused by the sudden movements of the earth?
(a) Volcano
(b) Folding
(c) Flood plain
(d) All of these
Ans: (a)
Volcano is caused by the sudden movements of the earth. A volcano is a vent opening in the earth’s crust through that molten material erupts suddenly.

Q8. Where are Mushroom rocks are found?
(a) Deserts
(b) River valleys
(c) Glaciers
(d) Sea cliff
Ans: (a)
An active agent of erosion and deposition in the deserts is win(d) In deserts rocks are in the shape of a mushroom, commonly called mushroom rocks.

Q9. What is known as the steep rocky coast rising most vertically above the sea water?
(a) Sea cliff
(b) Glaciers
(c) Sea waves
(d) Stacks
Ans: (a)
The steep rocky coast rising most vertically above the sea water is called sea cliff. The sea waves deposit sediments along the shores forming beaches.

Q10. Where is the Angel falls located?
(a) South Africa
(b) South America
(c) South India
(d) None of these
Ans: (b)
There are thousands of small waterfalls in the worl(d) The highest waterfall is Angel Falls of Venezuela in South Americ(a)

Q11. What are the sudden movements in the earth crust are called?
(a) Focus
(b) Deposition
(c) Erosion
(d) Earthquake
Ans: (d)
Endogenic forces sometimes produce sudden movements and at the other times produce slow movements. Sudden movements like earthquakes and volcanoes cause mass destruction over the surface of the earth.

Q12. What do you mean by a glacier?
(a) Moving of Layer of earth
(b) Moving of Soil
(c) Moving of ice
(d) None of these
Ans: (c)
Moving rivers of ice are called glaciers.

Q13. What are the types of earthquake waves?
(a) P wave
(b) S wave
(c) L wave
(d) All of the above
Ans: (d)
P wave and longitudinal waves, S wave or transverse waves and L waves or surface waves.

Q14. What do you know by Ox-bow Lakes?
(a) Lakes formed from animal participation
(b) Lakes for ox
(c) Cutting of meander loop from main rivers
(d) None of these
Ans: (c)
When the meander loop is cut off from the main river it forms a cut-off lake. As its shape is like an ox-bow, it is also known as ox-bow Lake.

Q15. What are sand-dunes?
(a) Low hill-like structures
(b) Big mountains
(c) Volcano
(d) None of these
Ans: (a)
Sand dunes are low hill-like structures formed by the deposition of sand in the deserts.

Q16. What do you mean by erosion?
(a) Moving of plates
(b) Type of exogenic forces
(c) Wearing away of landscape
(d) None of these
Ans: (c)
Erosion is the wearing away of the landscape by different agents like water, wind and ice.