screw - Students, Britannica Kids

A simple mechanical device, the screw usually consists of a metal shaft with a spiral groove and a head. The head can be slotted to fit a straight-blade screwdriver, it can…

spring - Students, Britannica Kids

Atlantic slave trade - Students, Britannica Kids

American Revolution - Students, Britannica Kids

Archimedes' screw - Wikipedia

Atlantic slave trade - Students, Britannica Kids

Simple Machine Screw Nut and Bolt

Industrial Revolution - Students, Britannica Kids

American Revolution - Students, Britannica Kids

Screw - Simple Machines lesson for kids by www.makemegenius.com

Sheep Life Cycle, Anatomy, and Types: Fun Activities and

screw - Students, Britannica Kids

Britannica Students