PuffBy: Emily Kate Moon Illustrator: Emily Kate Moon Series: A Science Pals Book Breathe deep and prepare to sail like the wind, with the sweetest puff of air in all the atmospherepart of the Science Pals series, including Drop: An Adventure through the Water Cycle and Ray: How Light Works Look who just blew in! Meet Puff. He's air. And he's a gas! Puff has been here for billions of years, forming a blanket of protection around Earth to hold in heat and
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