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How would you like to know more about the planet Earth?  This is the fourth in a series of five podcasts, looking at 10 things that you never knew about Earth.  Today's facts:

7.  In the past, sea levels were very different.

8.  Our sun has a voracious appetite.

For more information please visit:

http://climate.nasa.gov/interactives/slideshow_ten_things

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