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

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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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NATURAL                  jl.fhsdjkfhuidyhs                                                          PROCESSED

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Iron-lingot-jewerly
Sheep-Wool-Shawl
Chiken-egg-friet egg
Sand set procesed- window
Elephants tusk- ivory- piano

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Raw materials are materials taken directly from nature that we process into other material 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 materials).

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When we process raw materials become process materials

when a process matirial resut it very different to a raw material

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

1. We obtain plastic from crude oil,

2.  we obtain metal and glass from the rocks,

we obtain flour from wheat.

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Raw materials:

Wool-Animal
Marble-Mineral
Linen-Animal
Clay-Mineral
Cork- Plant
Sand-Mineral
Silk-Animal