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Grade 4 Pulleys and Gears
Pulley and Gear videos and links for Grade 4 science
Levers and Pulleys
Simple Machines Symbaloo
Elementary science links for students and teachers to simple machines
Interesantes webs sobre inventos e inventores para trabajar AICLE.
Engineering Design Challenge
simple machines, levers, pulleys, wheel& axle, inclined plane, screw, wedge