Gravity Is a Mystery - Dr. Franklyn M. Branley - Paperback Bog - HarperCollins - 2007 - Engelsk - Booktok.dk

Read and find out about gravity in this colorfully illustrated nonfiction picture book. What goes up must come down. Everybody knows that. But what is it that pulls everything from rocks to rockets toward the center of the earth? Its gravity. Nobody can s

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