The document describes different structures including the Great Wall of China, wheelchairs, chicken eggs, bricks, helmets, beam bridges, truss bridges, suspension bridges, and arch bridges. It notes key details about each structure such as whether they are solid, frame, or shell structures and their purposes which include defense, transportation, incubation, construction, and bridge building.

1. SCIENCE 2009
Structures
By: choclaterice-1

2. Great Wall of China
 The Great Wall of China
is a man made structure.
 It is a solid structure
 it is about 6,400km
long.
 Purpose to keep
intruders out and away
and maintain peace.

3. Wheel Chair
 The Wheel chair
is a man made
structure
 It is a frame
structure.
 It is for handicap
people that are
paralyzed.

4. Chicken eggs
 The chicken
egg is a shell
structure
 It can be any
size depending
on the chicken.
 The purpose is
to hold baby
chickens inside
so they can
hatch.

5. Bricks
The brick is a solid
structure.
 It is man made.
 purpose is to build.

6. Helmet
 The helmet is
a solid structure.
 it is for safety.
 The purpose
is to be safe for
construction.

7. Beam bridge
 is most
common
bridge used
 simple is
supported at 2
ends
 longer ones
supported by
additional piers

8. Truss Bridge
 light weight but strong
 made of trusses along
its side
 Shell structure

9. Suspension Bridge
 Hangs between two
ends that hold it up.
 modern suspension
bridge has tall towers
on either end that
support the main
cables.
 main cables are
anchored to concrete
at each end of the
bridge.

10. Arch Bridge
 designed to withstand
heavy loads
 dynamic load of people
and other traffic causes
each piece of wood or
stone in the arch to push
against the piece next to it.
 This push is eventually
transferred to the end
supports, which are
embedded in the ground.