Structures
Because they are not easily bent, _____ are used in buildings.
columns
The force that pulls objects to Earth is _____.
gravity
compound
Because they are curved, _____ are used to help spread out weight.
arches
Opposite poles of a magnet ______.
repel
A seesaw is an example of an _____ plane.
inclined
The base of any building that keeps it strong is the _____.
foundation
Magnets has ____ poles.
two
A device that helps make work easier is a ____.
machine
A _____ is strong because it has a wide base.
pyramid