Multiple choice

Your ears may pop on an airplane because pressure is moving from

  1. high to low

  2. low to high
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

As an airplane climbs, the cabin pressure decreases, moving from high to low pressure. The air trapped in your inner ear is at a higher pressure, and it pushes outward to equalize with the lower pressure outside, causing your ears to pop.

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