18.
a. Reusing is using the same item many times for the same or a different purpose than the item was initially made for. Recycling is to reprocess an item into a different item.
b. Two examples of reusing are using tote bags for grocery store shopping instead of plastic bags, and using metal water bottles instead of plastic water bottles. Two examples of recycling are recycling glass bottles, cans, paper, and plastic bottles into their proper disposal containers.
19. renewable resources: fertile soil, plants, animals, and fresh water.
nonrenewable resources: natural gas, coal, metals, and petroleum.
20.
a. Reusing
b. Recycling
c. Reusing
21. A light bulb is produced from plastics, chemicals, and glass. A newspaper is produced from plants and chemicals. One can throw a newspaper away in a trashcan, but light bulbs must be thrown away carefully because there are many chemicals inside. (ex. mercury).
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