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Aluminium because it has all the properties to do it.

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Aluminium.

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-Copper:  Bright, red-coloured metal that has been used since ancient times to make ornaments, coins and weapons.
-Tin : Silver-coloured shiny metal that is very resistant to corrosion.
-Aluminium:  White, cheap and easy to recycle.
-Zinc : Bluish-white in colour and is one of the least common metals.

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Cast iron

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Iron: When the percentage of  carbon in the alloy is less than 0.1%

Steel: 0.1%  to 2%

Cast Iron: 2% to 6.67%

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Stock forms of metal
- Plates
- Sections
- Ingots
Metals that contain mainly iron are called ferrous metals. Metals that do not have iron in their composition are called non-ferrous metals.”

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Mechanical properties:
- Hard
- Malleable
- Ductile
- Tough

Thermal properties:
- Good conductor
- They can expand and contract
- Can be soldered

Electrical and magnetic properties:
- Good conductors
Some have a magnetic behavior

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They are usually obtained from leftover wood.The most common ones are paper,cardboard and cork.

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Man-made wood enhaces the properties of natural wood and reduces its price,although it does not look as attractive as natural wood.The most importants types are plywood and chipboard.

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The advantages are a lot like they are hardness,the colour,the density,
The disadvantages are: they break easily and they can burn.

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Exercise 10                                                                                                                                                                                                                                           

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Exercise 10                                                                                                                                                                                                                                           

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Car headlight : they are translucent , they are toughnessm and they have a  thermal expansion.

Mattress : they are opaque, they can be soft or hard.

Golf club : they are opaque,  toughness.

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The advantage of the plastic and the wood ones are : they are cheaper and more soft. But they can be broken easily.
The ones that are make of silver and aliminum are more atractive and they are nice to touch. But they are more expensive and unconforteable.

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Umbrella : weight as little as posible, it has to be cheap, they are impermeable, they can be opaque or  transparent.

Chair : can be atractive,  we can buy with, they are  hardness.

Frying pan : to weight as little as posible, they are cheap or expensive, they are opaque and are bad for children.

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Each material has certain characteristics or properties that make it suited to a certain use.

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When we process raw material,they become processed materials .

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Raw materials are materials taken directly from nature that we process into other materials to make products with.

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we prepare or refine raw materials to obtain natural materials.

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-Shoe : wool
-Partition wall : clay
-Streetlight :  aluminum or iron
-Stay cables : iron

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Any material used to construct an object is called a technical material.

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Wool -animal
Marble -mineral
Linen - animal
Clay - mineral
Cork - plant
Sand - mineral
Silk - animal

Wool

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| NATURAL  | PROCESSED
| Silk | Lycra
| Slate | Steel
| Latex
| Brass
| Cork

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Sheep - wool - sweater
Cotton - cotton - t-shirt
Marble - brick - sculpture
Tree - wood - paper
Cow - leather - jacket