Question: Your ears pop when you change altitude quickly- such as during takeoff or landing in an airplane, or during a drive in the mountains. Curiously,

Your ears "pop" when you change altitude quickly- such as during takeoff or landing in an airplane, or during a drive in the mountains. Curiously, if you are a passenger in a high-speed train, your ears sometimes pop as the speed of the train increases rapidly- even though there is little or no change in altitude. Explain.

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