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10 Cards in this Set

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