Introduces the nature, sources, and uses of electricity and discusses what life was like before electric appliances and how saving electricity causes less pollution.
We use all kinds of machines and instruments to see, hear, record, measure, and detect changes in the world around us. Explore the variety of tools scientists have created to help in these investigations.
"What makes your ears pop in an elevator? What makes hot air balloons float up in the sky? Find out about all the things amazing air can do in this fun book." -- p. 4 of cover.
Introduces the three states of matter and discusses how material objects can change and how such natural materials as wood can become such manufactured articles as paper.