Jennifer Christiansen

This book is suitable for ages 7 to 8 years. Wedges are used to separate, lift, or hold things in place. One of humankind's most ancient tools, the wedge has a place in almost everyone's daily life. Learn more in this absorbing title.

This title is suitable for children of ages 7 to 8 years. Get ready to learn all about inclined planes in this fascinating book! See inclined planes at work in ramps and roller coasters, as well as their other applications and history. Kids get a hands-on approach to inclined planes in the exercise section, making and using their own inclined planes.