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So named by the Texas Tech Shackleton Glacier Expedition ( 1964 – 65 ) because of the ease with which they were able to approach the feature , and because of the relative simplicity of its geologic nature .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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