Our Changing Earth - Class 7 Social Science - Chapter 11 - Notes, NCERT Solutions & Extra Questions
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Back Questions - Our Changing Earth | Social Science Success | Social Science | Class 7
The Earth's crust is broken up into plates moving in relation to each other by about : }\end{array}$
(a) $2 \mathrm{~m}$ to $5 \mathrm{~km}$
(b) $25 \mathrm{~cm}$ to $50 \mathrm{~cm}$
(c) $2.5 \mathrm{~cm}$ to $5 \mathrm{~m}$
(d) $2.5 \mathrm{~cm}$ to $5 \mathrm{~cm}$
The Earth's crust is broken up into plates moving in relation to each other by about 2.5 cm to 5 m.
This movement of the lithospheric plates results in phenomena like earthquakes, volcanic eruptions, and faulting.
A volcano which has not erupted for centuries but may still do so is :
(a) Active volcano
(b) Dormant volcano
(c) Extinct volcano
(d) Dead volcano
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Sign up nowThe study of the behaviour of earthquake waves is called :
(a) Continental Drift
(b) Plate tectonics
(c) Seismology
(d) Meteorology
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Sign up nowRapids and waterfalls are features formed by :
(a) River erosion
(b) River deposition
(c) Glacial erosion
(d) Sea waves
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Sign up nowA feature formed due to deposition by sea waves is :
(a) Moraine
(b) Sand dune
(c) Sea cave
(d) Beach
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Sign up nowAfter the collapse of the cave roof due to erosion by sea waves, parts of the cave wall are left as:
(a) Moraines
(b) Hoodoos
(c) Stacks
(d) Natural arch
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Sign up nowThe forces which act in the interior of the earth are called as:
(a) Slow forces
(b) Speed forces
(c) Endogenic forces
(d) Exogenic force
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Sign up nowWhich of the following is 'Not' an exogenic force?
(a) Volcano
(b) Wind
(c) Sea waves
(d) Glaciers
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Sign up nowAn earthquake is measured with a machine called a
(a) Theismograph
(b) Heismograph
(c) Seismograph
(d) Meismograph
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Sign up nowThe earth's crust is broken into a number of huge parts. They are called
(a) Lithospheric plates
(b) Metamorphic plates
(c) Sedimentary plates
(d) None of these
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Sign up nowThe place on the surface above the focus is known as:
(a) Epicentre
(b) Focus
(c) Forces
(d) Lithosphere
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Sign up nowThe ______________________ is the scale used to measure the intensity of seismic waves during tremors.
(a) Plane scale
(b) Richter scale
(c) Compass
(d) Divider
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Sign up nowIn which continent is the highest waterfall Angel Falls of Venezuela located?
(a) South America
(b) South Africa
(c) North India
(d) None of these
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Sign up now'Niagara falls' is located on the border between
(a) Canada and USA
(b) India and China
(c) India and Pakistan
(d) India and Nepal
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Sign up nowMatch the following
Column A | Column B |
---|---|
1. Sudden and violent vibrations | (d) Earthquakes |
2. Wearing down and carrying away of rocks | (e) Erosion |
3. Rivers form loops | (a) Meanders |
4. Glaciers found in mountains | (b) U-shaped valley |
5. Work of wind | (c) Mushroom rocks |
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Sign up nowGive one word for the following
1. Horse-shoe shaped lakes formed by rivers __________________.
2. A dead volcano __________________.
3. Triangular piece of land formed at the mouth of river due to deposition __________________.
4. Breaking up of rocks on the earth's surface __________________.
5. Pieces of rocks, sand and silt debris deposited by glaciers __________________.
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Sign up nowWhat causes convection currents inside the earth's crust?
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Sign up nowWhat forces up the molten magma on the earth?
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Sign up nowName the scale used to measure the intensity of the seismic waves.
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Sign up nowName the two forces that continuously wear down the rocks on the earth's surface.
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Sign up nowWhat is the result of horizontal tectonic movements?
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Sign up nowWhat do you understand by 'plate tectonics'?
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Sign up nowWhat causes volcanic eruptions?
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Sign up nowWhat type of features are formed by vertical tectonic movements?
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Sign up nowWhat is meant by weathering?
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Sign up nowHow are waterfalls created?
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Sign up nowDistinguish between the following :
(a) Weathering and erosion
(b) Active volcanoes and dormant volcanoes
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Sign up nowWith the help of diagram explain the formation of an 'ox-bow lake',
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Sign up nowExplain briefly the work of wind as an agent of erosion.
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Sign up nowThe earth experiences about a million of earthquakes every year, about two earthquakes per minute. What can we do to minimize the effects of earthquakes?
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Sign up now"Weathering refers to processes that break the rocks into smaller and smaller pieces". Does weathering provide some benefits also? Explain.
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Sign up nowCase Study based questions
Read the passage given below and answer the questions that follow.
As the river approaches the sea, the slow moving river deposits its heavy load of sediments which it can no more carry. The deposits cause the river to break up into distributarles and bralded channels. A triangular piece of land is formed at the mouth of the river due to deposition.
1. What kind of landform is formed due to the above given process?
(a) Delta
(b) Sand dunes
(c) Levees
(d) None
2. By what process does it form?
(a) Deposition
(b) Erosion
(c) Weathering
(d) None
3. What is the shape of the formed landform?
(a) Round
(b) Oval
(c) Triangular
(d) None
4. Where does the landform form?
(a) At the river mouth
(b) Along the sides of the river
(c) At the shore
(d) None of these
H. Assertion-Reason type questions
In the questions given below, there are two statements marked as Assertion (A) and Reason (R). Read the statements and choose the correct option.
(a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
(b) Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).
(c) Assertion (A) is true but Reason (R) is false.
(d) Assertion (A) is false but Reason (R) is true.
1. Assertion (A): The deltas are formed near the mouth of the river.
Reason (R): The velocity of the river becomes slow when it approaches the sea.
2. Assertion (A): The earth's landscape is continuously changing with new landforms forming and older ones degrading.
Reason (R): The endogenic and exogenic forces of the earth are responsible for the formation anc degradation of landform.
3. Assertion (A): The majority of Himalayan rivers are perennial.
Reason (R): They are nourished by melting snow.
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Sign up nowSolve the puzzle by following your search horizontally and vertically and circle the answers from the following clues :
(i) Volcanoes which have not erupted for centuries but may still do so.
(ii) Instrument used to record the earthquake tremors.
(iii) Result of horizontal tectonic movements.
(iv) River plunging down from great height.
C | Y | L | G | B | D | O | R | M | A | N | T |
---|---|---|---|---|---|---|---|---|---|---|---|
I | V | O | L | C | A | N | O | F | G | Q | X |
N | Z | U | A | S | P | M | L | O | E | S | S |
T | B | X | C | O | Q | R | F | O | C | U | S |
H | E | A | I | T | O | E | O | Z | L | M | N |
W | A | T | E | R | F | A | L | L | Y | X | P |
O | C | B | R | D | H | K | D | E | L | T | A |
L | H | C | S | E | J | H | I | O | U | S | E |
X | E | E | O | X | C | A | N | T | R | A | T |
Y | S | E | I | S | M | O | G | R | A | P | F |
(v) Rivers of ice found in high mountains.
(vii) An opening in the earth's crust.
(ix) Deposits by wind. (vi) Deposition of sediments by sea waves.
(vili) Point where the vibrations orlginate.
(x) Trlangular plece of land formed at mouth of river.
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Notes - Our Changing Earth | Class 7 Social Science Success | Social Science
Comprehensive Class 7 Notes on Our Changing Earth: Key Concepts and Study Guide
Introduction
Understanding the dynamic nature of our planet is essential to grasp how natural forces continuously shape and reshape our Earth. This guide provides detailed notes on Class 7 topics related to Earth's ever-changing surface, offering insights into the numerous natural processes responsible for these changes.
Understanding the Earth's Interior
The Earth is composed of several layers, each playing a crucial role in its geological processes.
Crust: The outermost layer where we live.
Mantle: Located below the crust, it contains semi-solid rock...
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