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From which perspective is formation of life-supporting conditions on Earth best understood?

Answer and explanation

Correct answer: From an integrated Earth system perspective

The correct answer is option A: an integrated Earth system perspective. Earth’s habitability developed through interactions among the atmosphere, hydrosphere, lithosphere, biosphere and incoming and stored energy. Cooling of the planet helped a crust form; water vapour condensed; atmospheric composition changed; life influenced the atmosphere, including oxygen levels; and the ozone layer reduced harmful ultraviolet radiation. These processes occurred over long periods and cannot be explained by one isolated sphere or event. Option B is too narrow because modern humans appeared very late in Earth’s history. Option C describes a study technique, not a scientific perspective. Option D has no valid connection with habitability. The memory cue is “spheres interact, habitability develops.”

Related tags

Earth SystemHabitabilityGeological EvolutionEarth ScienceEvolution Of The EarthThe Origin And Evolution Of The EarthGeographyClass 11 Mcq

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