Incredible But True Incredible But True Human World History Makers Cities Of The World Art And Music Sporting Headlines Plant Life Fish, Amphibians, Reptiles Birds and Mammals Creepy Crawlies Marine Life Restless Earth Earth's Secrets Changing Weather Seas And Oceans Comparisons Amazing Structures Machines And Man World Of Inventions Travelling Around Mysterious Universe	Deep Ice Greenland is covered by an ice cap that can be as much as 3,000 metres thick. Vikings in Greenland   Previous: Back Book: Incredible But True Section: Incredible But True Chapter: Changing Weather