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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.

Expert · Level 1 · 25 questions

Practice questions

01Which source pair most clearly shows balanced use of direct sample and indirect clue for Earth's deeper parts?

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02If temperature rises in mines but mining reaches only limited depth what is the best analysis?

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03When both velocity and direction of seismic waves change which conclusion is more suitable?

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04In which situation is it more scientific to link absence of S waves with the outer core?

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05What is the main benefit of studying gravity anomaly and seismic velocity together?

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06What is the main error in treating meteorites as direct samples of Earth's centre?

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07Which evidence is most suitable for the Moho boundary?

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08Which argument is more accurate in identifying the Gutenberg boundary?

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09If P wave velocity decreases and its path bends which combined explanation should be preferred?

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10Which source is most relevant for explaining the Lehmann boundary?

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11What is the most suitable scientific meaning of a seismic shadow zone?

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12If a magnetic anomaly is found why will it not be final proof of the complete state of the core?

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13Why can volcanic materials be called direct but limited sources?

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14Earth's mean density being higher than surface rocks strengthens which argument?

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15In which situation will conclusion be made carefully due to conflict between seismic and gravity clues?

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16What is the correct relation of geothermal gradient and radioactive decay in context of internal heat?

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17What is the correct difference in nature of evidence between rock sample and seismic wave?

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18If P wave is recorded first and S wave later on a seismogram what is understood?

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19If a wave returns and also changes direction at a layer boundary what analysis is suitable?

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20Which option correctly matches source and scope?

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21If a direct sample is local what is the problem in drawing conclusion for the whole interior from it?

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22Which combined evidence is more suitable for liquid state and metallic nature of outer core?

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23If underground structure is inferred from artificial seismic waves what method is it?

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24How should information of different depths from lava and seismic waves be connected?

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25What conclusion can be cautiously drawn from presence of S waves?

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