The igneous rock, if it has pushed its way, as a magma into the surrounding sedimentary rock such as a sandstone or a limestone and cooled off, will have a relative age as younger than the sedimentary rock. Also, if the igneous rock has altered the sedimentary rock at their contact, then the alteration will have a similar age to the igneous rock age.
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B. the Appalachian Mountains and the Laurentian Mountains
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What sentence? I mean where are the sentences.
I think you didn't complete the question mate!
