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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 1 · 25 questions

Practice questions

01If P wave velocity suddenly increases at the Moho what is the most scientific inference?

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Answer and explanation

02Which observation gives the strongest clue for the liquid state of the outer core?

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03If P waves bend while entering the outer core what is the main reason?

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04What is considered the reason for the solid inner core despite high temperature?

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05Which option correctly distinguishes chemical and mechanical layers of Earth?

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06What is the most suitable reason for linking asthenosphere with a low velocity zone?

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07If oceanic crust is subducting in an area what is the main physical reason?

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08Disappearance of S waves at the Gutenberg discontinuity identifies which boundary?

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09Study of seismic shadow zones provides evidence for what inside Earth?

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10Which option gives a deeper correct comparison of SIAL and SIMA?

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11In which situation can a gravity anomaly indicate internal density difference?

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12Why are magnetic studies especially linked with Earth's outer core?

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13Which option most correctly states the limitation of a direct source?

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14Why are meteorites considered useful in studying Earth's internal structure?

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15If a seismic station records P waves but not S waves what inference is more suitable?

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16Which statement best explains the real nature of the mantle?

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17The seismic importance of Lehmann discontinuity is linked with what?

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18If heat flow is high in a region which internal process may it indicate?

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19Which option gives an exam useful explanation of geothermal gradient?

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20In which situation would it be more suitable to link a rocky layer with continental crust?

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21In which situation would it be more suitable to link a rocky layer with oceanic crust?

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22Why may continental crust be thicker below mountain regions?

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23Which statement correctly combines thickness and density of the crust?

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24Which option gives an incorrect match of discontinuity and boundary?

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25Why does density generally increase toward Earth's centre?

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