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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

TOPIC PRACTICE

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25 questions

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  1. Solar nebula was the common source and temperature gradient differentiated composition
  2. Earth was the common source and Moon made temperature
  3. Comets were the common source and oceans made planets
  4. All planets formed at the Milky Way center and stayed identical
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  1. Temperature decreased with distance from the Sun and different materials condensed at different temperatures
  2. All planets formed at equal distance from Earth
  3. The Moon distributed all materials equally
  4. There was no temperature difference in the solar disk
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  1. Thermal pressure completely stops gravity in the cloud
  2. Gravity becomes stronger than internal pressure and contracts the cloud
  3. The Moon pulls the gas cloud toward Earth
  4. A comet changes the cloud into planetesimals
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  1. Revolution of planets
  2. Tides of the Moon
  3. Internal gas pressure and energy from fusion
  4. Collision of comets
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  1. In the core of the Sun
  2. In Earth's oceans
  3. On the surface of the Moon
  4. In the orbital motion of planets
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  1. Different materials became solid at different temperatures so planetary composition varied
  2. All planets formed from the same material in equal quantity
  3. The Sun colored the planets later
  4. The Moon changed gases into metals
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  1. Solar gravity had ended there
  2. Availability of icy solids was greater there
  3. Planets did not move in orbits there
  4. All bodies there were stars
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  1. Because gas removal makes the Sun smaller
  2. Because after gas removal rock changes into metal
  3. Because gas giants needed large cores while gas was still present
  4. Because gas removal makes Earth a galaxy
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  1. They were larger than Jupiter
  2. They formed outside the Sun
  3. They had no orbit
  4. Light gases could not remain due to lower mass and solar wind
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  1. It disturbed many asteroid orbits and prevented stable accretion
  2. It turned all asteroids into the Sun
  3. It formed Earth's oceans
  4. It made the asteroid belt the surface of the Moon
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  1. It tells the color of planets
  2. It measures moonlight
  3. It determines the age of ancient meteorites and rocks
  4. It decides the direction of a comet tail
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  1. They formed from modern Earth's atmosphere
  2. They are present sunspots
  3. They are main sequence stars
  4. They show less altered composition of primitive solar materials
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  1. They are counted among the oldest solid solar materials
  2. They are modern clouds of Earth
  3. They are rivers of the Moon
  4. They are rings of Jupiter
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  1. First differentiation then dust particle formation
  2. First accretion enlarged the body then heating led to differentiation
  3. First oceans formed then the Sun formed
  4. First the Moon formed then all planets formed
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  1. Because gases came out from Earth's interior
  2. Because it formed the Sun's core
  3. Because it made Pluto a major planet
  4. Because it stopped planetary orbits
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  1. The Moon came from the Sun's core
  2. The Moon formed from debris after impact between Earth and a large body
  3. The Moon formed from Jupiter's gas
  4. The Moon is a star of the Oort Cloud
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  1. It turns Earth into the Sun
  2. It ends all oceans
  3. Its gravity helps prevent very large changes in Earth's axial tilt
  4. It moves Earth out of the Milky Way
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  1. Only modern rainfall
  2. Growth of vegetation
  3. Oceans inside the Sun
  4. More impact events in the early solar system
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  1. They can indicate supply of water and volatile materials
  2. They turn Earth into a star
  3. They stop the Sun's orbit
  4. They are the surface of the Moon
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  1. Transfer of matter and angular momentum in the disk
  2. All planets giving their own light
  3. The Moon becoming the Sun
  4. Earth becoming a comet
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  1. It can remove remaining disk gas and limit gas giant formation
  2. It instantly makes Earth Jupiter
  3. It moves all planets out of the Milky Way
  4. It makes the Moon an ocean
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  1. Temperature was high there so they could not easily remain solid
  2. There was no gravity there
  3. There were only oceans there
  4. All bodies there were stars
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  1. It explains that orbits and distribution of small bodies can change later
  2. It proves that planets never formed
  3. It makes the Sun revolve around Earth
  4. It makes all stars into comets
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  1. The region where a planet can gravitationally hold small bodies
  2. The region where the Sun makes water
  3. The region where a star goes out
  4. The region where Earth becomes a galaxy
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  1. Tidal forces can break a small body if it comes too close
  2. It stops Earth's weather
  3. It turns the Sun into the Moon
  4. It teaches planets to emit light

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