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NHPR reporter Sam Evans-Brown does a regular answer-reader-question feature called Ask Sam. This week’s takes on a question I hadn’t really thought about: How tall were the Appalachian Mountains, including the White Mountains, when they were first formed by plate tectonics? Were they as big as the Himalayas?

You’ll have to read or listen to the episode to find out: It’s right here. Get to the end, or you’ll miss the Brie cheese.

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