Jennifer Boothroyd 
How Big? How Heavy? How Dense? [EPUB ebook] 
A Look at Matter

Audisee(R) e Books with Audio combine professional narration and text highlighting for an engaging read aloud experience! A light beach ball floats on the water. A heavy rock sinks in the mud. Matter is all around us. But what makes a beach ball different from a rock? And what properties do we use to compare matter? Read this book to find out!