The amount of sea ice surrounding Antarctica varies on a seasonal basis depending on the amount of sunlight reaching the continent. The animation below shows the change in ice cover around Antarctica during 1991. After watching the seasonal variation, use NIH Image to calculate the following:

  • What percent of the continent is permanently covered in ice?
  • How many square miles does the ice cover at its peak?

The Gulf of Maine Research Institute has written detailed directions on the use of NIH Image.

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