Rau, Dana Meachen.
Simple machines / Dana Meachen Rau. - New York: Scholastic, 2012. - 48 pages.
How did workers in ancient civilizations move the huge stones they used to build cities? They rolled the stones over logs much like a modern-day conveyor belt.
Inside, you'll find:
-How humans have used simple machines throughout history;
-A timeline, photos- and how simple machines can be combined to do different jobs;
-Surprising TRUE facts that will shock and amaze you!
9780531265864
SC R19 2012
Simple machines / Dana Meachen Rau. - New York: Scholastic, 2012. - 48 pages.
How did workers in ancient civilizations move the huge stones they used to build cities? They rolled the stones over logs much like a modern-day conveyor belt.
Inside, you'll find:
-How humans have used simple machines throughout history;
-A timeline, photos- and how simple machines can be combined to do different jobs;
-Surprising TRUE facts that will shock and amaze you!
9780531265864
SC R19 2012