Introduces the basic forms of matter: solid, liquid and gas and how matter can change from one form to another. The terms melting point, freezing point and boiling point are clearly explained. Includes a hands-on activity that demonstrates how different liquids evaporate at different rates.
An introduction to density that explains how it determines whether objects float or sink and discusses how people use floating and sinking in their lives.
Summarizes how water changes from a solid to a liquid and back again, and introduces related facts such as water freezes at thirty-two degrees Fahrenheit and ice floats.