Question

Unconformities occur when _____.

younger rock is placed on top of older rock
igneous structures cut across
eroded surfaces are covered by younger rock
an entire sedimentary bed is deposited at the same time

Answer 1

The answer is: [C]: "eroded surfaces are covered by younger rock" .
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"Unconformities occur when eroded surfaces are covered by younger rock ."
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Answer 2

The answer is the third one