Well, your first error is that the highest peak in the Appalachians is over 2000m. So there's that.
Originally Posted by stitt29
Your second error is that, in fact yes, they were that tall just a couple hundred million years ago. So there's that as well.
Look, I grew up in the foothills of the San Gabriel Mountains in Los Angeles, California. The San Gabriels are falling down as fast as they're being built up because of a combination of geological stresses and erosion. (To be a little more specific, the geological stresses cause erosion, inasmuch as they break the bedrock into easier-to-fall pieces.) They were never as high as the Himalayas; there's no requirement that they had to have been. But I learned in my college geology class that, were they not, as stated, falling down a lot, they'd be the fastest-growing mountain range in the world; there's an argument, of course, that they are anyway.
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