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The Rocky Mountains are described as younger because the Rocky's are really two mountain chains. The older mountain chain started billions of years ago, and the younger mountain chain pushed the older mountain chain up more, only 60 millions years ago.
Answer:
A New Kind of Light in the Universe? “Super-Planckian” Material Emits Light That Exceeds Limits of Natural Law
C. allows historians to confirm that a source’s information is correct. Hope that helps!
