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Subjects

Geography

Star formation, formation of planets, and our solar system

In this Class 11 Geography topic from “The Origin and Evolution of the Earth,” students explore how stars form from vast clouds of gas and dust and how planets emerge from the material surrounding a young star. They examine the formation and organisation of the solar system, including the Sun, planets, satellites, asteroids and comets, while connecting these processes with Earth’s place, structure and early development within the wider universe.

Expert · Level 1 · 25 questions

Practice questions

01Why is the modern solar nebula model not considered merely speculation?

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02Which initial condition is most decisive for star formation in a giant molecular cloud?

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03What is the most important difference between a protostar and a main sequence star?

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04What was the main physical reason for the solar nebula changing into a flattened disk?

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05The abundance of metals and silicates in inner planets is the result of which selective process?

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06Why could the cores of giant planets grow rapidly beyond the frost line?

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07How did solar wind affect planet formation in the early inner solar system?

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08Which process has the most direct role in forming protoplanets from planetesimals?

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09Which condition was most necessary for differentiation to begin in early Earth?

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10The nearly same direction of planetary revolution in the solar system strengthens which idea?

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11What is considered one major reason a full planet did not form in the asteroid belt?

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12Why is the study of carbonaceous meteorites important for the origin of the solar system?

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13Which combination mainly allowed outer planets to retain light gases?

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14The nearly circular and coplanar nature of planetary orbits is best explained by which model?

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15Why is the early sticking of dust grains in a protoplanetary disk important?

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16What can result from fragmentation within a cloud during star formation?

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17Which combination is most correct among the heat sources of early Earth?

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18The concentration of iron and nickel in Earth's core is evidence of what?

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19Why is the nebular hypothesis considered more acceptable than older tidal theories?

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20Why is low temperature helpful in a star forming region?

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21What is the basic idea of runaway growth in planet formation?

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22The giant impact hypothesis helps explain which feature of the Earth Moon system?

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23What is the major difference between the Kuiper Belt and the main asteroid belt?

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24The Oort Cloud hypothesis is mainly used to explain the origin of what?

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25What is the main criterion for considering Pluto a dwarf planet rather than a planet?

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