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Geography

Interior structure of the earth

In Class 11 Geography, this topic from the chapter “Interior of the Earth” explains how scientists understand the planet’s hidden layers. Students study the crust, mantle, and core, along with the differences between the inner and outer core. They explore how seismic waves, gravity, density, temperature, and pressure provide evidence about Earth’s composition and physical state. The topic also introduces major discontinuities that mark boundaries between layers and helps connect Earth’s internal structure with processes such as volcanism, earthquakes, and plate movement.

Hard · Level 3 · 25 questions

Practice questions

01If a seismic profile shows P wave velocity increasing below the Moho while S waves continue what is the most suitable inference?

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02In which situation would the inference of a liquid outer core be most logical?

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03If a low velocity zone is identified in the upper mantle what could be its most suitable cause?

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04Which option gives the correct analysis of seismic wave and medium?

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05Why does wave behaviour change greatly at the Gutenberg discontinuity?

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06If a model describes the core as SIAL what is the biggest error?

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07If continental crust is thicker yet less dense than oceanic crust which concept does it help explain?

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08Which option gives the best reason for the subduction tendency of oceanic crust?

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09In which condition would identification of Lehmann discontinuity be clearer?

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10Why is the inner core considered solid unlike the outer core?

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11How can seismic tomography show heterogeneity inside Earth?

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12Which statement correctly connects energy and effect of mantle convection?

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13If unusually high gravity values are found in an area what type of internal structure becomes more likely?

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14Which option gives the correct combination of sources of Earth's internal heat?

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15Why is studying geothermal gradient useful in Earth's internal structure?

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16Which option correctly analyses the limitation of direct and indirect sources?

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17If a rock sample has ultramafic nature like peridotite which layer is it most suitably linked with?

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18In which situation is mentioning Conrad discontinuity most appropriate?

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19If an option says the mantle is entirely liquid what is the strongest counter argument?

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20Which option gives correct outer to inner chemical order and main material clue?

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21Why does P wave shadow zone require explanation by refraction rather than complete absence?

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22Why is the S wave shadow zone considered more direct evidence of liquid outer core?

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23If a question asks Earth average radius and core beginning depth together which pair is correct?

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24Which statement explains the tectonic importance of density difference between oceanic and continental crust?

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25Which option gives the most scientific reason for pressure increase inside Earth?

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