Discussion
Assertion (A): The lithosphere matters for climate on geological timescales but not on decadal ones.
Reason (R): Weathering and volcanism operate over millions of years.
Answer: B
Both are true and the reason gives the timescale, and it is why the slow carbon cycle is left out of models used to project the coming century. Millions of years is its timescale. The fast carbon cycle is a quite separate matter.
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