Materials, New and Old

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Where do the materials we use come from?

Can you guess?

Hint: There are three types.

Natural Materials

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Examples of Natural Materials

• Stone (granite, flint, soapstone, etc.)• Wood and plant fibers• Animal parts (antlers, fur, bones, etc.)• Metal (naturally occurring copper, gold,

silver, etc.)• Composites (clay, porcelain, soil, etc.)

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Processed Materials

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Examples of Processed Materials

Metals from ore, such as iron

Alloys, such as bronze

Hides tanned into leather

Sand used to make glass

Mud combined with straw to make adobe bricks

Clay fired into pottery6

Human-Made MaterialsVarious plastic products, toys, cups, etc.

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Examples of Plastics

PET or PETE (polyethylene terephthalate): Found In Soft drink, water bottles

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More Plastic Materials

HDPE (high density polyethylene): Found in milk jugs, water bottles, some trash and shopping bags, butter and yogurt tubs, and cereal box liners.

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More Plastic Materials

PVC Polyvinyl chloride, Found In: Window cleaner and detergent bottles, clear food packaging, siding, windows, piping.

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More Plastic Materials

Nylon: Found in clothing, athletic equipment, carpet, and rugs.

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Recycling Human-made materials

Some plastics are difficult to recycle

Because they are new to nature, they may take a long time to decompose

Increasing use of plastics makes disposal a problem

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