Escalators (How It Works)

By Kelli L. Hicks and Kelli Hicks

Book Overview

An escalator is a moving staircase with steps that go up or down. This book discusses how an escalator if based off a conveyor system, moving objects up and down using gears and chains that are... This description may be from another edition of this product.

• Format: Paperback
• Language: English
• ISBN: 1627177698
• ISBN13: 9781627177696
• Release Date: August 2014
• Publisher: Rourke Educational Media
• Length: 24 Pages
• Weight: 0.20 lbs.
• Dimensions: 8.3" x 0.3" x 8.0"
• Age Range: 5 to 8 years
• Grade Range: Preschool to Grade 3