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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.

Expert · Level 5 · 25 questions

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  1. Because it explains river floods
  2. Because it comes from Earth's core
  3. Because it is a group of planetesimals
  4. Because it was considered a remnant signal of the early hot universe
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  1. Both link the solar system with cloud-like material
  2. Both describe Earth as flat
  3. Both form planets from river deposits
  4. Both place life before planets
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  1. Direction of present monsoon
  2. The unclear physical process of stable planets forming from rings
  3. Soil fertility
  4. River meanders
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  1. The universe remaining same on average
  2. Ejected solar matter immediately becoming rivers
  3. Small solid bodies joining to form larger bodies
  4. Increase of oxygen in the atmosphere
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  1. It explains the Big Bang very well
  2. It directly forms the hydrosphere
  3. It explains the composition of rocky planets
  4. A close passing star is rare and hot ejected solar matter is difficult to form stable planets
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  1. Because planets formed in a flat rotating disk
  2. Because planets formed in present oceans
  3. Because all planets broke from Earth
  4. Because the universe was static
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  1. Soil colors
  2. Ordered similar-direction motion of planets
  3. Freshness of river water
  4. Height of mountains
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  1. Rivers were more there
  2. Earth's crust had spread there
  3. Icy materials and gases could remain there in larger amounts
  4. Red shift had stopped there
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  1. They broke from outer planets
  2. They formed through the steady state theory
  3. They formed from water vapour
  4. In the hot region light gases were less and rocky-metallic materials dominated
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  1. Icy cores and greater gas accumulation in colder regions
  2. Accumulation of river deposits
  3. Breaking of Earth's crust
  4. Direct planet formation by the Big Bang
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  1. They formed rivers
  2. They helped remove light gases
  3. They started the Big Bang
  4. They changed the core into atmosphere
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  1. Planet formation from river valleys
  2. Earth formation from new matter in steady state
  3. Planet formation in protoplanetary disks
  4. Sun formation from Earth's crust
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  1. Direction of present monsoon
  2. Soil fertility
  3. Average density of steady state
  4. Leftover early construction material of the solar system
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  1. Conditions formed for early matter and light elements
  2. Rivers formed immediately
  3. Earth's crust formed directly
  4. The present oxygen atmosphere formed
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  1. They directly formed rivers
  2. They became the broad cosmic basis for later stars and solar nebula material
  3. They formed Earth's present monsoon
  4. They immediately solidified the crust
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  1. River courses remain same
  2. Earth's crust does not change
  3. The universe's average density and form remain same
  4. Planets form from oceans
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  1. Oceans formed first
  2. Earth was flat
  3. The Sun formed from Earth
  4. The universe had an early hot state and expansion
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  1. First accretion increased mass, then differentiation occurred after heating and melting
  2. Differentiation occurred first and then Earth's mass formed
  3. Both are names of only the Big Bang
  4. Both are only atmosphere formation
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  1. It formed river valleys
  2. It allowed heavy and light materials to separate according to density
  3. It produced red shift
  4. It formed steady state
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  1. Outgassing
  2. Red shift
  3. Density-based differentiation
  4. Water vapour condensation
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  1. Cosmic background and stars
  2. River deltas and coasts
  3. Steady state and red shift
  4. Mantle and upper crustal parts
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  1. Heating, melting, and differentiation
  2. River deposition, soil formation, and farming
  3. Red shift, galaxy, and steady state
  4. Solar wind, Big Bang, and monsoon
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  1. It formed the Sun's orbits
  2. It released water vapour and other gases from Earth's interior
  3. It made the universe static
  4. It made planets rocky
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  1. Reformation of the solar nebula
  2. Stopping of the Big Bang
  3. Later formation of oxygen-rich atmosphere through biological processes
  4. Formation of planets from oceans
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  1. Cooling condensed water vapour and solid crust provided a base for water retention
  2. Red shift formed water vapour and rivers
  3. Steady state formed oceans and crust disappeared
  4. Solar winds filled oceans

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