The most extreme weather conditions experienced in Antarctica are associated ________ blizzards.
with
15
These are simply strong winds with falling snow _____, more commonly snow that is picked up and pushed along the ground by the wind.
or /and
20
Blizzards may last for days at _____ time, and in some cases it can be almost impossible for people to see.
a
15
It is not unusual ______ objects to be thrown vast distances.
for
15
During these blizzards, it is not unusual for objects only about a metre or ______ away to become unrecognisable.
so / less / two
15
Scientists doing research in the area _____ then confined to their tents or caravans.
are
15
We think of blizzards _______ extremely cold.
as
15
In fact temperatures in the Antarctic are usually higher than normal ______ a blizzard.
during
15
_______ may be eight or ten blizzards in any particular place throughout the year.
There
15
Eight or ten such blizzards in any particular place ______ an annual basis.
on
15
They often cause considerable damage, so that any scientific buildings or equipment constructed in this region must be specially made to give as _______ protection as possible.
much
15
If the weather is good, visibility in Antarctica is usually excellent because of the clear air and the absence of dust and smoke. ________ this means is that people often greatly underestimate the distance of the landscape.
What
15
Also, very large features _____ as mountains may appear to be above the horizon.
such
15
In rare times mountains may even appear to be upside _____.
down
15
These 'mirages', ______ are just tricks played by the eyes, have confused many explorers.
which
15
These have led to explorers in the Antarctic making many errors ______ judgement.
