Willis, Shirley

Text and simple illustrations provide information about the speed.

Text and simple illustrations provide explanations of the principles of flight.

Simple Spanish text and activities explain the nature of time, its importance, and its measurement, exploring days of the week, seasons, months of the year, the concepts of past, present, and future, and more.

Introduces the concepts of distance and length, discussing how they are measured, why measuring is important, units of measure, perspective, and the reasons for measuring a variety of objects and distances.

Introduces the concept of weight, discussing units of weight, methods of measuring weight, and the importance of weight measurement for a variety of uses.

Text and simple illustrations provide explanations of the principles of flight.

A simple introduction to the concepts of speed, resistance, and friction, the different measurements of speed and distance, and machines that can increase speed, such as jet engines and roller skates.

Introduces the concepts of distance and length, discussing how they are measured, why measuring is important, units of measure, perspective, and the reasons for measuring a variety of objects and distances.

Questions and answers explain water, the water cycle, and such aspects of weather as rain, clouds, ice, and snow. Includes experiments and activities.

Simple text and activities explain the nature of time, its importance, and its measurement, exploring days of the week, seasons, months of the year, the concepts of past, present, and future, and more.