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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.

Expert · Level 6 · 25 questions

TOPIC PRACTICE

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  1. Orbital rearrangement of outer planets and scattering of small bodies
  2. Modern weather on Earth
  3. Solid crust of the Sun
  4. Oceans of Mercury
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  1. It can change or stabilize orbits through regular gravitational pulls
  2. It turns off solar energy
  3. It removes planetary mass
  4. It turns comets into plants
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  1. Orbital resonance with Jupiter
  2. Clouds of Venus
  3. Formation of the Moon
  4. Earth's rainfall
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  1. Stability of gravitational regions sharing an orbit with a planet
  2. Stability of solid mountains inside the Sun
  3. Stability of orbits without planets
  4. Stability of oceans without atmosphere
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  1. Gravitational capture
  2. Birth inside the Sun
  3. Only breaking from Earth
  4. Formation from oceans
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  1. Regular satellites may form from a disk and irregular satellites may be captured
  2. Both always broke directly from the Sun
  3. Both have no gravitational relation
  4. Both belong only to Earth
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  1. It can bend orbits and send them inward or outward
  2. It turns comets into the Sun
  3. It makes comet mass zero
  4. It always completely ends orbits
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  1. It could rearrange icy body orbits and place some in resonances
  2. It could stop the birth of the Sun
  3. It could erase Earth's crust
  4. It could make Mercury an ocean
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  1. Some comets can come from very long period orbits
  2. All comets form inside Mercury
  3. Comets have no orbits
  4. Comets are always stationary planets
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  1. The Kuiper Belt is a disk like region beyond Neptune and the Oort Cloud is considered a distant nearly spherical source
  2. Both are Earth's oceans
  3. Both are inside the Sun
  4. Both contain no icy bodies
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  1. Solar wind and radiation pressure push material away from the Sun
  2. The comet pulls the Sun
  3. The tail forms by Earth's gravity
  4. A comet has no gas
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  1. Internal outgassing and some asteroid sources may also play roles
  2. Comets never contain ice
  3. Earth has no water
  4. A river of water comes from the Sun
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  1. They contributed to atmosphere formation by releasing internal gases
  2. They turned the Sun into dust
  3. They removed planetary orbits
  4. They made comets terrestrial planets
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  1. Cooling then condensation of water vapor then accumulation of surface water
  2. Ocean then Sun then cloud
  3. Jupiter then rainfall then Sun
  4. Permanent sea without crust
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  1. Biological processes producing and accumulating oxygen were not widespread
  2. The Sun had no light
  3. Earth had no gravity
  4. Oceans were always metal
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  1. Significant rise of free oxygen in the atmosphere
  2. Birth of the Sun
  3. Formation of Jupiter's rings
  4. Pluto becoming a terrestrial planet
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  1. By reducing the effect of charged particles from solar wind
  2. By ending gravity
  3. By sending water into the Sun
  4. By turning atmosphere into rock
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  1. Motion of conducting fluid creates electric currents and magnetic fields
  2. Fixed rocks create the field without motion
  3. Sunlight directly makes a magnet
  4. Oceans make orbits
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  1. It could be difficult to preserve the atmosphere for a long time
  2. Mars became the Sun
  3. Mars has no rocks
  4. Mars is an outer gas giant
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  1. Difference in solar distance atmospheric composition and greenhouse effect
  2. Identical oceans on both
  3. No atmosphere on Venus
  4. Earth being a gas giant
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  1. It powers mantle convection and makes crustal movement possible
  2. It removes the Sun from orbit
  3. It makes comets into gas
  4. It makes all planets icy
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  1. Larger planets retain internal heat for longer and can therefore remain geologically active for longer
  2. Smaller planets produce more internal heat and are therefore always more active
  3. A planet’s size does not affect its cooling rate or geological activity
  4. Larger rocky planets do not form a crust, so they remain geologically active
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  1. Heavy elements provide solid grains and rocky planet material
  2. Metallicity removes gravity
  3. Metallicity is only sunlight
  4. Metallicity makes planets invisible
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  1. Volatiles such as water ammonia and methane are relatively more important in them
  2. They are made only of iron
  3. They formed inside the Sun
  4. They have no volatile materials
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  1. Molecular cloud instability then protosun disk then dust growth planetesimals then protoplanets and planet migration
  2. Planet migration then dust then birth of Sun then molecular cloud
  3. Oceans then Kuiper Belt then Sun
  4. Comets then life then nebula

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