18. Reusing and recycling:
a. Reusing is using items that can be refurbished or repaired, rather than sent to a landfill. Recycling is gathering certain items to be reprocessed, allowing them to be used again.
b. Reusing: reusable water bottles and donating clothes to charity. Recycling: cardboard and tires can be recycled.
19. Renewable and nonrenewable resources:
a. Renewable: trees, animal waste, fruits, and wind.
b. Nonrenewable: nuclear power, minerals (copper, gold, silver), helium, and lignite (soft, brown fuel).
20. Recycling or reusing:
a. Reusing
b. Recycling
c. Reusing
21. A light bulb is produced from plastics, chemicals and glass, while a newspaper contains plants and some chemicals. A newspaper can be thrown away in a trashcan, but light bulbs must be disposed of carefully taking into consideration the chemicals contained inside. The problem is the mercury, which incandescent light bulbs do not contain. When recycling, newspapers can just be shredded up and put into the cycle again, but light bulbs must be carefully taken apart.
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