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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.

Hard · Level 3 · 25 questions

Practice questions

01If a question asks both common source and temperature based composition of planets what is the most suitable answer?

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02Why did planetary composition change gradually from inner to outer parts of the early solar disk?

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03What is the most correct meaning of gravitational instability in star formation?

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04In a stable star what condition balances gravitational contraction?

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05Although most mass of the solar system is in the Sun where is a large part of angular momentum found?

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06How does the condensation sequence explain planetary composition in the solar disk?

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07What is the most suitable reason for larger planetary cores beyond the frost line?

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08Why was the speed of gas removal from the protoplanetary disk decisive for outer planet formation?

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09Why could terrestrial planets not retain thick hydrogen helium atmospheres?

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10What was Jupiter's gravitational resonance role in keeping the asteroid belt?

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11How does radiometric dating help in knowing the age of the solar system?

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12Why is the study of chondrite meteorites special in solar system origin?

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13Why are calcium aluminium rich inclusions considered important in solar system studies?

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14Which is the correct sequence of accretion and differentiation in Earth's formation?

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15Why is outgassing linked with Earth's secondary atmosphere?

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16What is the most suitable description of Moon origin in the giant impact hypothesis?

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17How is the Moon considered helpful in stabilizing Earth's axis?

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18What do many craters on ancient planetary surfaces indicate?

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19Why are carbonaceous chondrites considered important in Earth's development?

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20What can be one effect of viscosity like processes in a protoplanetary disk?

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21How can strong stellar wind in a young Sun like stage affect planet formation?

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22Why is lack of volatile ices expected in the inner part of the solar system?

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23Why is the idea of planetary migration useful in solar system studies?

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24What does the idea of the Hill sphere explain in the study of satellites?

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25How is an idea like the Roche limit linked with rings and satellites?

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