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Subjects

Geography

Sources of information

In Class 11 Geography, this topic introduces how scientists investigate the Earth’s interior, which cannot be observed directly. Students distinguish direct evidence from mines, deep drilling and volcanic materials, and indirect evidence from seismic waves, meteorites, gravity, magnetic fields, and variations in temperature and pressure. The topic explains how these sources help infer the Earth’s internal structure and composition within the chapter Interior of the Earth.

Medium · Level 4 · 25 questions

Practice questions

01If gravity value is low which inference is more suitable?

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02Information from ocean floor rocks is most directly useful in which study?

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03What information can be obtained from chemical testing of a rock in a laboratory?

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Answer and explanation

04Why is information obtained from mines considered limited?

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05Study of volcanic gases can indicate what?

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06Why can lava not be considered a direct sample of every deep layer?

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07Use of artificial seismic waves will be considered what type of method?

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08If magnetic value is abnormal in an area why should it not be treated as a direct final conclusion?

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09Why are seismic and magnetic evidences considered together in studying the core?

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10Which option contains only clue based sources?

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11Which option contains only sample based sources?

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12Why do direct sources become less useful for Earth's deep interior?

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13Decrease in velocity of seismic waves can show possibility of what?

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14Which conclusion is more scientific from comparison of S waves and P waves?

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15If a student has to write evidence of internal heat which example is most suitable?

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16How do conclusions become more reliable through seismic station networks?

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17Which method is most suitable for drawing correct conclusions about internal structure?

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18Which option shows an incorrect match of source and information?

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19Which source gives the most direct information about chemical nature of the crust?

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20While studying sources of the interior which classification is useful first?

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21A student says gravity anomaly is a direct source. How should it be corrected?

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Answer and explanation

22If P wave arrives but S wave does not arrive what type of layer becomes more likely?

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23In which situation will information from meteorites be most useful?

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24Why is comparison of all sources necessary in the study of Earth's interior?

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25If Earth's mean density is found higher than the density of surface rocks which conclusion is suitable?

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Answer and explanation

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