The most extreme weather conditions experienced in Antarctica are
associated (0)____________ blizzards. These are simply strong winds with
falling snow (13)____________, more commonly, snow that is picked up and
pushed along the ground by the wind. Blizzards may last for days at (14)____________time,
and in some cases it can be almost impossible for people to see. It is not unusual
(15)____________objects only about a metre or (16)____________away to
become unrecognisable. Scientists doing research in the area (17)____________then
confined to their tents or caravans. We think of blizzards (18)____________extremely
cold, while in fact temperatures in the Antarctic are usually higher than normal
(19)____________a blizzard. Major blizzards of several days in length occur
more frequently in some locations than in others. (20)____________may be
eight or ten such blizzards in any particular place (21)____________an
annual basis. They often cause considerable damage, so that any scientific
buildings or equipment constructed in this region must be specially made to
give as (22)____________protection as possible.
If the weather is fine, visibility in Antarctica is usually excellent
because of the clear air and the absence of dust and smoke. (23)____________this
means is that people often greatly underestimate the distance of objects
and features of the landscape. Also, very large features (24)____________as
mountains may appear to be above the horizon, or even upside (25)____________.
These 'mirages', (26)____________are just tricks played by the eyes in
certain conditions, have led to explorers in the Antarctic making many
errors (27)____________judgement.
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