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10 Cards in this Set
- Front
- Back
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As you climb above sea level, the air becomes (thinner, thinnest)
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thinner
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On mountains, your lungs take in (less, least) oxygen than at sea level.
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less
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As altitude increases, breathing becomes (more difficult, most difficult).
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more difficult
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The sickness can begin at any altitude (higher, highest) than a few thousand feet.
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higher
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The (worse, worst) symptom of all is a headache.
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worst
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Even the (more healthier, healthier, healthiest) traveler can experience sickness.
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healthiest
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After a short walk, you can feel (tired, more tired, most tired) than a marathon runner
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more tired
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The (better, best) way to avoid sickness is to climb slowly.
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best
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The (more important, most important, most importantest) piece of equipment is an oxygen tank.
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most important
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At the (greater, greatest, most greatest) heights, climbers carry special equipment.
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greatest
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