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Linking methane and ammonia with primitive atmosphere indicates which atmospheric condition?

Answer and explanation

Correct answer: Low free oxygen and chemically different condition

The direct answer is B: low free oxygen and a chemically different atmosphere. In the earliest stage of Earth, the atmosphere was not like the present atmosphere. Today, free oxygen is an important part of air, but primitive Earth had very little free oxygen. Volcanic and chemical gases such as methane and ammonia could therefore remain in the atmosphere. The reasoning is: methane and ammonia are unusual when compared with the main gases of modern air; their presence indicates a different chemical mixture; very little free oxygen was available to change or remove them; therefore the primitive atmosphere was chemically different and oxygen-poor. Option A is wrong because a fully oxygen-rich condition would not match the usual description of the primitive atmosphere. Option B is correct because it states both important ideas: low free oxygen and a different chemical composition. Option C is wrong because a complete ozone cover is not what the presence of methane and ammonia directly indicates; ozone is connected with oxygen and ultraviolet radiation. Option D is wrong because modern industrial pollution belongs to a much later human period, not to the natural early atmosphere of Earth. Memory cue: primitive atmosphere means reducing or oxygen-poor conditions, while modern atmosphere means much more free oxygen.

Related tags

Methane Ammonia Primitive AtmosphereEvolution Of The EarthThe Origin And Evolution Of The EarthGeographyClass 11 Mcq

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