b) The Appalachian Mountains of North America were formed when two tectonic plates
moved towards each other and one of them got pushed upwards. They were formed
more than 480 million years ago.
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Explanation:
The direct cause of the creation of the Appalachian Mountains was the merging of all continents into the supercontinent Pangea as the Iapetus Ocean closed 290 million years ago. Baltica and North America had merged to form effectively creating the ancestral northern Appalachians.
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