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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 1 · 25 questions

Practice questions

01If a rock sample is analysed in a laboratory how will it help in internal study?

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02Observation of increasing temperature in a deep mine strengthens which conclusion?

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03In which situation will scientists treat seismic waves as indirect evidence instead of direct samples?

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04If gravity value in an area is lower than normal what may it indicate?

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05Different velocity of P waves in different media indicates what?

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06Which is the most suitable evidence for the liquid state of the outer core?

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07Why is the study of seismic shadow zones important?

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08Why are meteorites considered indirect evidence in studying Earth's interior?

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09What is the main difference between core samples from drilling and seismic waves?

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10Which statement is correct about geothermal gradient?

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11Which example shows the best match of source and information?

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12If scientists depend only on mines what problem will arise in studying Earth's interior?

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13For what purpose are waves produced by artificial explosions used?

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14Which feature of seismic waves is useful in identifying the Moho boundary?

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15Which evidence is most useful in studying the Gutenberg boundary?

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16Why is volcanic lava called useful but limited source?

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17What can absence of S waves in a region indicate?

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18What is understood about Earth's internal layers by comparing P and S waves?

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19Why is information about increasing pressure inside Earth important?

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20Which option is the correct group of only direct sources?

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21Which option is the correct group of only indirect sources?

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22What is the correct relation between seismograph and seismogram?

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23On what basis is the Lehmann boundary understood?

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24If a magnetic anomaly is found in an area what possibility will scientists consider?

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25Why is radioactive decay linked with the source of internal heat?

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