Explore the characteristics and changes of states of matter—and save 20%—with UNIT FOURTEEN: STATES OF MATTER, from the Foundations Science Curriculum series. This unit highlights 1) the physical properties of matter, including mass and volume, 2) characteristics of the four natural states of matter, and 3) physical vs. chemical changes. States of Matter offers a wide variety of resources to keep your young scientists engaged; and planning is a breeze with the Teacher’s Guide, which includes det