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Solved CBSE Class 7 Geography Chapter 3 Assertion and Reason Questions – Our Changing Earth. Here we (Net Explanations) working very hard to providing you with the Important Assertion Reason Questions for this Chapter.
Assertion and Reason Questions – Our Changing Earth
Q.1 There are two statements given below, marked as Assertions (A) and Reasons (R) . Read the statements and choose the correct option.
- Assertion (A): The lithospheric plates move very slowly which causes changes in the surface of the Earth.
- Reason (R) : The lithospheric plates move because of the presence of the molten rocks inside the Earth.
a.) Only R is correct
b.) Both are correct and R is the explanation of A
c.) Both are incorrect
d.) A and R both are correct but R is not the explanation of A.
Answer: Both are correct and R is the explanation of A.
- Assertion (A): There are two forces which act inside and outside of the Earth.
- Reason (R) : Endogenic forces are the one which causes destruction like Earthquakes and Volcanoes.
a.) Both are correct and R clearly explains A
b.) Only A is correct
c.) Both are correct but R is not the explanation of A
d.) Only R is correct
Answer: Both are correct and R clearly explains A.
- Assertion (A): An opening or vent in the Earth’s crust through which the molten magma erupts is called volcano.
- Reason (R) : Cooled down substances come out through volcanoes which eventually formed rocks.
a.) Only A is correct
b.) Only A is correct and R is the explanation of A
c.) Only R is correct
d.) Both the statements are incorrect
Answer: Only A is correct and R is the explanation of A
- Assertion (A): The movement of the lithospheric plates causes vibrations which travel all around the Earth causing earthquakes.
- Reason (R) : It is the movement of the lithospheric plates outside the earth which causes the earthquake.
a.) Only A is correct and R is not the explanation of A
b.) Only R is correct
c.) Both are correct and R is the correction of A
d.) Both are incorrect.
Answer: Only A is correct and R is not the explanation of A.
- Assertion (A): The epicenter is the place just above the focus and the place where the movement starts is called focus.
- Reason (R) : Highest damage is usually caused to the place usually close to the epicenter.
a.) Both A and R are correct and R is the explanation of A.
b.) Only R is correct
c.) Both are incorrect
d.) A is the correct statement.
Answer: Both A and R are correct and R is the explanation of A.
- Assertion (A): Earthquakes cannot be predicted so it is very important that safety measures should be taken beforehand.
- Reason (R) : Information regarding earthquakes is alerted a day prior to the earthquake.
a.) Only A is correct and R is incorrect
b.) A is correct and R is the correct explanation of A
c.) Both are incorrect
d.) Only R is correct
Answer: Only A is correct and R is incorrect.
- Assertion (A): Weathering is the breaking up of rocks on the surface of the Earth.
- Reason (R) : Some of the rocks are carried away by the winds and water and eventually get deposited.
a.) Both are correct and R is the explanation of A
b.) Both are correct but R is not the explanation of A
c.) Only A is correct
d.) Both are incorrect.
Answer: Both are correct but R is not the explanation of A.
- Assertion (A): When the river overflows its bank, it leads to flooding of neighboring areas.
- Reason (R) : Floodplains are usually formed before the flood occurs.
a.) Both A and R are correct and R is the explanation of A.
b.) Only R is correct
c.) Both are incorrect
d.) Only A is correct
Answer: Only A is correct.
- Assertion (A) : The speed of the flowing river decreases as it approaches the sea.
- Reason (R) : The decreased speed of the river causes it to break into a number of streams.
a.) R is incorrect
b.) Both A and R are correct and R is the correct explanation of A.
c.) Both are incorrect
d.) Only A is correct
Answer: Both A and R are correct and R is the correct explanation of A.
- Assertion (A) : Sea waves continuously strike the rocks which eventually develop cracks. Over time, these cracks become bigger and bigger called Sea Caves.
- Reason (R) : When only the roof of the caves remains, it eventually forms stacks.
a.) Both are correct and R is the explanation of A.
b.) Only A is correct
c.) R is incorrect
d.) Both are correct but R is not the explanation of A.
Answer: Only A is correct.
- Assertion (A) : Melting ice gets filled with water and forms beautiful lakes in the mountain. It carries small and big rocks .
- Reason (R) : Glacial moraines are the deposits which are carried by the melting ice when it forms lakes in the mountain.
a.) Both are correct and R clearly explains A.
b.) Only R is correct
c.) Both are incorrect
d.) Both are correct but R is not the explanation of A.
Answer: Both are correct and R is the explanation of A.
- Assertion (A) : Rocks in the deserts are called mushroom rocks because they are in the shape of mushrooms.
- Reason (R) : Wind erodes the upper section of the rocks more than the lower section.
a.) Both are correct and R is the explanation of A
b.) Only R is correct
c.) Both are incorrect
d.) Only A is correct
Answer: Only A is correct.
- Assertion (A) : An agent of erosion and deposition in the desert is wind and it carries and transports sand from one place to another.
- Reason (R) : When the wind stops blowing, it deposits the sand in the low hills forming the sand dunes.
a.) Only R is correct
b.) Both are incorrect
c.) Both are correct and R is the correct explanation of A
d.) A and R are incorrect.
Answer: Both are correct and R is the correct explanation of A.
- Assertion (A) : When the grains of sand are very light, they are carried in long distances which get deposited in long distances called loess.
- Reason (R) : Loess are the deposits of both heavy and light grains.
a.) Both are correct
b.) Only R is correct
c.) Both are correct but R is the wrong explanation of A
d.) Only A is correct.
Answer: Only A is correct.
Also See: Inside Our Earth Chapter Assertion and Reason Type Questions