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Geography

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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.

Hard · Level 3 · 25 questions

Practice questions

01In which situation will drilling evidence be direct but inadequate for the deep interior?

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02If P waves pass through a region but S waves are absent there what is the most scientific explanation?

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03Why do global records of seismic stations make inference of internal structure more reliable?

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04Why would it be wrong to decide chemical composition of underground material only from gravity anomaly?

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05What is the main reason for studying magnetic field and seismic waves together for the core?

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06Why would it be careless to treat meteorites as direct evidence of Earth's centre?

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07How should geothermal gradient and radioactive decay be understood in different roles?

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08Why is it incomplete to link seismic shadow zone only with earthquake intensity?

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09Which evidence is considered most decisive in identifying the Moho boundary?

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10Change in wave behavior at the Gutenberg boundary is linked with which major conclusion?

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11Which source gives the most suitable evidence for the Lehmann boundary?

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12If crust composition is studied from mine samples but core composition is decided from the same samples what is the error?

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13Which option gives correct analysis of direct and indirect sources?

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14Why is it not correct to apply information from ocean floor rocks to the core?

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15What caution is necessary while interpreting deep rock fragments brought by volcanoes?

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16What limitation should be remembered while treating borehole temperature data as evidence of internal heat?

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17Why is it wrong to treat absence of S waves as evidence of empty space?

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18What cautious conclusion about the outer core can be drawn from refraction of P waves?

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19Comparison of Earth's mean density and lower density of surface rocks strengthens which argument?

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20Why will information from artificial seismic waves not be called direct evidence?

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21What is the best use of different arrival times of waves in a seismogram?

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22Why are body waves considered more useful than surface waves in internal study?

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23Why is studying reflection and refraction together necessary in studying internal boundaries?

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24If both P wave velocity and gravity value increase in a region what is the most cautious conclusion?

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25Why is indirect evidence needed for the deep core even when direct samples are available?

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