Yang, Ji-an creator Bahng, Jeong-hwa ill. United States Big & small 2016 eng 1 v.(unpaged) col. ill. Gravity is a force that pulls objects toward the earth. We cannot feel gravity. But it affects everything on the planet. Because of gravity we can walk. Apples fall off trees. Let's find out more about the invisible force of gravity. Written by Ji-an Yang; illustrated by Jeong-hwa Bahng IB Program. Livro de uso exclusivo dos professores. [E] 9781925248715 00002e/00002e4a.jpg 00002e/00002e4a.jpg BR-BrIDEA 118032