Discussion
Assertion: the present is the key to the past in geology. Reason: the processes acting today also acted throughout geological history.
Answer: B
Correct answer: both the assertion and the reason are true and the reason explains the assertion
Both are true and the reason gives the mechanism. Because the same physical and chemical processes have operated throughout, a rock formed in the past can be interpreted by observing what produces such rocks today. Note what the principle does not claim - not that rates were constant, nor that no catastrophic events occurred, only that the processes were the same.
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