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The changing Earth
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Africa animals Antarctica Arctic areas Asia atoms Australia baby biggest birds blood blue whale body bones brain built called carbon cells chemical chimpanzee China colors contain creatures decibels desert Earth eggs electric electrons energy feed fish flowers fossils frog galaxy giant giant panda grasslands gravity ground grow hair heat helium huge hydrogen ice age insects inside land largest layers leaves light light-years liquid live lndia lungs magma magnetic marsupials melanin meters miles molecules Moon mountain move muscles Muslim nerve North nuclear nuclear fusion ocean oxygen particles plants plates poisonous pollinated prey rain forests rivers rocks rodent scientists sea lions seals seeds skin snakes soil South America species sq km stars substance surface temperature tiny Transform faults trees tropical Viking volcanoes waves wear weighs whale