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Materials, New and Old. Where do the materials we use come from?. Can you guess?. Hint: There are three types. Natural Materials. Examples of Natural Materials. Stone (granite, flint, soapstone, etc.) Wood and plant fibers Animal parts (antlers, fur, bones, etc.) - PowerPoint PPT Presentation
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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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