The extreme altitude changes bring runners through several climate zones.

Is there medication or some other way to protect ears from altitude changes?

The easiest hiking trails are located in the valley, where the altitude changes are generally minimal.

He felt his ears pop the same way they did during a too-rapid altitude change.

As ice cools it expands, and that would lead to an altitude change.

I worried that he was having an acute reaction to the altitude change.

The altitude changes radically through the region.

What we're doing is equalizing the pressure between the inside and the outside of our eardrum as the altitude changes.

For example, an altitude change of only 28 cm (11 in) causes water's boiling point to change by one millikelvin.

Variation is observed in the quantity of rainfall as the altitude changes to higher levels.