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What is dry ice?

glacier
solidified CO2
legendary alchemical substance
meringue dessert
Dry ice is used in refrigeration. It has an interesting property: it maintains a constant temperature of -78.5C in a warmer environment. This is because dry ice does not melt and sublimes directly into the gaseous form.
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glacier
solidified CO2
legendary alchemical substance
meringue dessert
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146

What sound can be heard when approaching an iceberg?

a cracking noise
a fizz
a roar
a whisper

This is Amundsen–Scott South Pole Station. Why is it elevated?

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to avoid heating the ground
to avoid being buried in snow

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in the upper atmosphere
in the depths of the glacier
from salt sea water

The director and scriptwriter of "Citizen Kane" is Orson Welles. And who played the main role?

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Werner Herzog
Mike Nichols
Orson Welles