Discussion
State whether the following is true or false.
Polar regions receive very little precipitation despite their permanent snow cover.
Answer: B
Correct answer: True
Antarctic and high Arctic precipitation is a few tens to a couple of hundred millimetres a year - less than many hot deserts - because cold air can hold very little water vapour. The permanent snow cover reflects the fact that almost nothing melts or evaporates rather than that much falls, so the accumulation of thousands of years builds an ice sheet from a very small annual input.
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