Tortoise has a series of unsuccessful attempts at making new shells after finding paper on the ground. His paper shell blows away in the wind. His wooden shell burns near a fire. His wool shell unravels after getting caught on a rose bush. He decides his final shell will be made of rubber and plastic, materials that are hard, waterproof, and won't burn or unravel like the previous shells.

1. Suddenly, Tortoise
sees some paper on
the floor. He has a
new great idea.
WHAT DO YOU
THINK IS
TORTOISE’S IDEA?
He sets to work
and he has a
beautiful new
colorful paper
shell. Tortoise is
happy but…

2. Unfortunately, the wind starts to blow and
Tortoise paper shell blows away.
WHY ?
WHAT DO YOU
THINK IS GOING
TO HAPPEN?
Tortoise has another idea. He makes a shell with
wooden sticks. He thinks it is stronger, but…

3. Tortoise walks near a
fire and the wooden
shell gets burnt.
Tortoise is not very
happy but he has
another idea:
He starts to knit a
fantastic warm wool
shell.
WHAT DO YOU
THINK IS IT THE
PERFECT
SHELL?

4. Tortoise feels warm
with his new shell but
he walks near a rose
bush and his lovely
warm wool shell begins
to unravel.
Tortoise is very angry
when he has a new idea.
He makes a rubber-
plastic shell.
ARE RUBBER
AND PLASTIC
GOOD
MATERIALS FOR
HIS NEW
SHELL?

5. PROPERTIES 4&5 : WOOL and PLASTIC/RUBBER PREDICTION
APPEARANCE Shiny Dull
TRANSPARENCY Opaque Transparent
STRENGTH Hard Soft
FLEXIBILITY Elastic Plastic
HEAT CONDUCTIVITY Conductor Insulator
PERMEABILITY Waterproof Absorbent
FLAMMABILITY Flammable Inflammable