By Mark Prigg
Even though North America is a full month into
astronomical spring, the Great Lakes have been slow to give up on the harsh
winter, Nasa has revealed. The space agency today published this stunning picture of
the Great Lakes, showing a third of their expanse is still covered in ice. Lake
Superior was found to be the most affected, and was found to be 63.5 percent
ice covered on April 20th.
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