question: What causes the alpine tundra to be so cold?
distractor3: low air density
distractor1: moderate altitude
distractor2: low altitude
correct_answer: high altitude above sea level
support: Alpine tundra climates occur at high altitudes at any latitude. They are also called highland climates. These regions are very cold because they are so far above sea level. The alpine tundra climate is very similar to the polar tundra climate.