Materials, New and Old

2 Where do the materials we use come from? Can you guess? Hint: There are three types.

Natural Materials 3

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.) 4

Processed Materials 5

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 6

Human-Made Materials Various plastic products, toys, cups, etc. 7

Examples of Plastics PET or PETE (polyethylene terephthalate): Found In Soft drink, water bottles 8

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. 9

More Plastic Materials PVC Polyvinyl chloride, Found In: Window cleaner and detergent bottles, clear food packaging, siding, windows, piping. 10

More Plastic Materials Nylon: Found in clothing, athletic equipment, carpet, and rugs. 11

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 12