An important characteristic of plains is their power to facilitate every phase of historical movement; that of mountains is their power to retard, arrest, or deflect it. Man, as part of the mobile envelope of the earth, like air and water feels always the pull of gravity.

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Attribution

Quote text and notes from Wikiquote: Ellen Churchill Semple (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.