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·Depending on the percentage of carbon in the alloy, ferrous materials an be classified as: iron, steel and cast iron.
·When the percentage of carbon in the alloy is less than 0.1%. we call this meterial iron.
·Steel is a ferrous material made mainly from iron with 0.1% to 2% carbon.
·Cast iron is made from iron and 2% to 6.67% carbon.

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Exercise 22.
We think it will be aluminium, its the most usual metal used for cans.

Exercise 23.
STATUE: We will use steel.

SARDINE TIN: We will use tin

WIRES FOR AN ELECTRICAL CIRCUIT: We will use copper.

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Exercise 12.
·Natural Wood:
·Man-Made Wood: Plywood, ash, fir, chipboard, lime.
·Wood derivates: Cork.

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·Mechanical Properties: They are hard, they are malleable, ductile and tough.
·Thermal Properties: They are very good conductors of heat, they expand and contract and some of them can be soldered to other metals.
·Electrical and Magnetic Properties: They are good conductors and some have a magnetic behaviour.
·Other Properties: Many rust easily, are sound conductors, are solid at room pemperature, are heavy and dense etc...

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EXERCISE 10:
°A car headlight : is madre up of plástic and glass.
*Plastic come from destillation of oil and from biodegradable plastic waste.
* And glass is obtained at about 1500°C from silica sand, sodium carbonate and limestone
· A mattress : is made up of foam , hybrid and innerspring.
* Foam : is a substance formes by trapping pockets of gas in a líquido por sólido.
*  Innerspring : is madre with a steel coil innerspring support system , with varios foams and fibers
* A golf club : is a club use to hit a golf ball in a game of golf. Each group is composed of a shaft with a grip and a club head

EXERCISE 11 :
Advantages :  tensile strenght , electrical and head resistance , sound absordtion and beaty
Desadvantages : durability , moisture , warping and burning

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Pag. 79

EXERCISE 9 :
· Chair  made of wood : is light and is very easily to move
· Chair made of plastic : is not very beautiful and is more ligh than a chair made of wood
· Earring made of silver : is very beautiful to wear it ,but is to much expensive

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EXERCISE 3 :

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Pag. 77

EXERCISE 5 :
·Shoe --> Is make of leather and plastic
·Partition wall --> Is make of bricks and wood
·Streetlight --> Is make of metal, plastic and glass
·Stay cables --> Is make of steel

EXERCISE 6 :

·Umbrella : Is made of plastic because is water proof.
· A chair : Is make of wood or metal because persons use to sit in it so the chair have to be tough
· A frying pan : Is made of metal and some plastic, because it have to be exposed to very high temperratures, so it should be made of metal; and the handle of the frying pan is made up of plastic because, like this, is more comfortable to cook.

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*Raw materials are materials taken directly from nature thet we process into other materials to make products with.
*We prepare or refine raw materials to obtain natural materials .
*When we process raw materials, they become processed materials (also called manufactured material).
*Any materials used to construct an object is called a technicall material.

EXERCISE 1:
Wool --> Animal
Marble --> Mineral
Linen --> Animal or Plant
Clay --> Mineral
Cork --> Plant
Sand --> Mineral
Silk --> Animal

EXERCISE 2:

·Cotton -> Animal -> T-Shirt

·Wood -> Plant -> Table

·Metal ->  Mineral -> Spoon

·Wool -> Animal -> Shoocks

·Straw -> Grasses -> Handback