Materials, New and Old
Where do the materials we
use come from?
Can you guess?
Hint: There are three types.
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Natural Materials
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Examples of Natural
Materials
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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 pottery
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Human-Made Materials
Various 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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