Willis, Shirley

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

this book any=swers the questions about flight, wind, air current, gravity,propulsion , and how aircraft fly.

Uses simple experiments and activities to explore concepts such as density, upthrust, and water displacement and to explain why objects float or sink.

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

Text and simple illustrations provide information about the moon, discussing its size, age, cycles, temperature, and other related topics.

Uses simple experiments and activities to explore concepts such as density, upthrust, and water displacement and to explain why objects float or sink.

Text and simple illustrations provide information about the moon, discussing its size, age, cycles, temperature, and other related topics.