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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 3 · 25 questions

Practice questions

01On what basis is rock obtained from a mine called a direct source?

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02What is the most correct reason for considering seismic waves an indirect source?

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03If a drill hole provides both temperature and rock information then it is an example of which source?

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04Why can deep rock fragments brought by volcanoes be useful for information about the mantle?

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05A sudden increase in P wave velocity may point towards what?

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06Stopping of S waves in a liquid region strengthens which conclusion?

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07Why is travel time of seismic waves compared at different stations?

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08Seismic shadow zone is understood through which combined process?

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09Which observation plays a major role in identifying the Moho boundary?

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10Which source clue is correctly related to the Gutenberg boundary?

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11Information about the Lehmann boundary is mainly linked with which type of evidence?

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12What type of geological difference can a gravity anomaly indicate?

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13Magnetic anomaly can show possibility of what type of internal material?

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14What caution is necessary when linking meteorites with Earth's composition?

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15Geothermal gradient systematically expresses which observation?

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16What is the reason for linking radioactive decay with internal heat?

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17Increase of pressure inside Earth is best explained by what?

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18If a question asks to identify only direct source which option is most suitable?

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19If a question asks to identify only indirect source which option is most suitable?

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20Which pair correctly matches source and evidence?

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21What can be understood from arrival order of waves while reading a seismogram?

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22Why are P and S waves more useful than surface waves in internal study?

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23When a seismic wave returns from a layer boundary what information does that process help provide?

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24When a wave changes direction in a different medium what information can be obtained?

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25If gravity value is high what may be the simple geophysical explanation?

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