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B. 
As we enter the 21st century, our perception of Antarctica has changed. Although physically 
Antarctica is no closer and probably no warmer, and to spend time there still demands a dedication not seen 
in ordinary life, the continent and its surrounding ocean are increasingly seen to be an integral part of Planet 
Earth, and a key component in the Earth System. Is this because the world seems a little smaller these days, 
shrunk by TV and tourism, or is it because Antarctica really does occupy a central spot on Earth’s mantle? 
Scientific research during the past half century has revealed—and continues to reveal—that Antarctica's 
great mass and low temperature exert a major influence on climate and ocean circulation, factors which 
influence the lives of millions of people all over the globe. 
 
C. 
Antarctica was not always cold. The slow break-up of the super-continent Gondwana with the 
northward movements of Africa, South America, India and Australia eventually created enough space 
around Antarctica for the development of an Antarctic Circumpolar Current (ACC), that flowed from west 
to east under the influence of the prevailing westerly winds. Antarctica cooled, its vegetation perished, 
glaciation began and the continent took on its present-day appearance. Today the ice that overlies the 
bedrock is up to 4km thick, and surface temperatures as low as -89.2deg C have been recorded. The icy blast 
that howls over the ice cap and out to sea—the so-called katabatic wind—can reach 300 km/hr, creating 
fearsome wind-chill effects, 
 
D. 
Out of this extreme environment come some powerful forces that reverberate around the world. 
The Earth’s rotation, coupled to the generation of cells of low pressure off the Antarctic coast, would allow 
Astronauts a view of Antarctica that is as beautiful as it is awesome. Spinning away to the northeast, the 
cells grow and deepen, whipping up the Southern Ocean into the mountainous seas so respected by mariners. 
Recent work is showing that the temperature of the ocean may be a better predictor of rainfall in Australia 
than is the pressure difference between Darwin and Tahiti—the Southern Oscillation Index. By receiving 
more accurate predictions, graziers in northern Queensland are able to avoid overstocking in years when 
rainfall will be poor. Not only does this limit their losses but it prevents serious pasture degradation that may 
take decades to repair. CSIRO is developing this as a prototype forecasting system, but we can confidently 
predict that as we know more about the Antarctic and Southern Ocean we will be able to enhance and extend 
our predictive ability.