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Which of the following best defines the principle of cross-cutting relationships?

A.cross-cutting rocks, such as an igneous intrusion, are younger than the rocks they cut through

B.only sedimentary rocks can cut through other sedimentary layers

C.when an igneous rock cuts through a sedimentary rock, the igneous rock must be older than the sedimentary rock

D.any rock that cuts through another rock will contain older fossils than the rock it cuts through