Someone told me the Himalayas are much younger than spider, 50 million vs 300 million. But how do mountains grow and at what point does someone say “Thats when it became a mountain!”? Thanks!
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To address the question specifically of when a hill becomes a mountain: there is no official rule. Geologists used to say a hill rises to less than 1,000 feet above sea level and a mountain rises to higher, but they have since abandoned that distinction. Now whether something is referred to as a hill or mountain is due mostly to history, during which time it would be based on subjective criteria like whether the summit was rounded or whether it had a gradual slope.
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