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What has shrunk roughly the length of two football fields in the last billion years?

 
Cafe Meghan

Asked by Cafe Meghan at 3:14 PM on Sep. 2, 2010 in Crazy for Credits

Level 14 (1,375 Credits)
This question is closed.
Answers (5)
  • The moon
    momof3angela

    Answer by momof3angela at 3:15 PM on Sep. 2, 2010

  • Polar Ice Caps.
    thatgirl70

    Answer by thatgirl70 at 3:14 PM on Sep. 2, 2010

  • ice caps
    AMom29

    Answer by AMom29 at 3:15 PM on Sep. 2, 2010

  • ozone layer
    fiatpax

    Answer by fiatpax at 3:23 PM on Sep. 2, 2010

  • The Moon
    cynprz

    Answer by cynprz at 3:33 PM on Sep. 2, 2010