Description
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.
Crabtree Publishing Company
Juvenile Nonfiction
Technology
Edition: How Things Work/Are Made, Juvenile Nonfiction
Keywords: Technology
