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Subjects

Geography

Early and modern theories

In Class 11 Geography, this topic explores how explanations for the origin and evolution of the Earth developed from early philosophical ideas to modern scientific theories. Students compare major hypotheses, including nebular explanations, and examine the astronomical, geological, and physical evidence used to understand the formation of the solar system and Earth. The topic also shows how observations, discoveries, and improved scientific models continually refine our understanding of the planet.

Hard · Level 6 · 20 questions

Practice questions

01How was Otto Schmidt's idea different from older theories of matter ejected from the Sun?

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02What was the significance of Weizsäcker's vortex idea?

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03What does the asteroid belt indicate in modern planet formation theory?

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04If a question asks both coplanar planetary orbits and different composition, which model is most suitable?

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05Which option correctly matches theory and scale?

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06Which sequence most correctly arranges cosmological and Earth-level events?

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07Which statement best shows the strength of the modern solar nebula model?

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08In which situation would tidal theory be the most suitable answer?

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09In which situation would the modern solar nebula model be the most suitable answer?

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10Which statement clarifies the mistake of writing only Big Bang for Earth's layer formation?

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11Water vapour, carbon dioxide, and nitrogen in the early atmosphere are linked with which source?

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12Which option gives the correct small-to-large direction of planet formation?

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13Which option correctly shows the evolving nature of scientific theories?

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14Which option gives the correct stage difference between planet formation and atmosphere formation?

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15Which statement gives the correct role of collisions in modern planet formation?

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16Which answer gives today's most accepted model for solar system origin with reason?

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17What role did the young Sun's solar winds play in the evolution of the solar system?

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18How do dust-gas disks observed around young stars support the modern solar nebula model?

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19Movement of iron and nickel into the core of early Earth is a more specific explanation of which process?

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20According to the modern solar nebula model, why did inner planets remain smaller than outer planets?

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