Sloping Up and Down explores the benefits and uses of the ramp. RobbO and RobbEE learn that a ramp is called an inclined plane. They discover that ramps are used for building stairs and escalators, and were even used as far back as ancient Egypt to build the pyramids.

Sloping Up and Down: The Incline Plane 2014, Crabtree Publishing Company

ISBN-13: 9780778704256

Trade paperback