Civil Services Prep

Prelims MCQ · Geography

During the evolution of the atmosphere and hydrosphere, which one of the following best explains a self-reinforcing link between the cooling of the Earth and the formation of oceans?

  1. Water vapour condensed as the Earth cooled; carbon dioxide dissolved in rainwater, causing further cooling and rainfall, and the water collected in depressions.
  2. Solar winds removed hydrogen and helium, while photosynthesis subsequently supplied oxygen to the oceans.
  3. Denser materials sank towards the centre, while lighter materials moved towards the surface and formed the Earth’s layers.
  4. Degassing and volcanic eruptions released water vapour and other gases into the atmosphere.
  1. A cultivated hillside is experiencing rapid runoff and the formation of several small finger gullies. Which…
  2. A geological survey records the following intrusive bodies: Body P is thin and nearly horizontal. Body Q is…
  3. A physiographic region has the following characteristics: Its principal river flows from northeast to…
  4. A place has the following characteristics: Its underlying land surface heats rapidly during summer and cools…
  5. A soil is deep, clayey and relatively impermeable. It becomes sticky when wet, develops wide cracks during the…
  6. A stream on one side of a divide has a steeper gradient and receives more precipitation than a neighbouring…