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                        What about the terrain has challenged explorers in the past as well as the present? 
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                        How many square miles of Antarctica are covered with a permanent ice sheet? 
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                        How many square miles is the actual land mass? 
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                        What percent of the continent is visible as mountains and coastlines? 
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                        What are the elevation extremes? 
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                        Is it true that the bedrock at the South Pole is at or below sea level? 
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                        What makes Antarctica the highest continent? 
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                        What is the highest point in Antarctica? 
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                        Identify the two major mountain ranges that make up the Antarctic continent.