Fossil fuels are considered non-renewable sources of energy because
A) their formation is so slow.
B) they release carbon dioxide when they are burned.
C) people are cutting down too many forests to allow trees to turn into coal.
D) carbon dioxide levels in the atmosphere are too low to allow fossil fuels to form.
A
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When the lower string is pulled slowly in the heavy-ball-and-strings demonstration (Figure 2.7 in your textbook), tension
A. is about the same in both strings. B. in the top string is due to your pull plus the weight of the ball. C. in the bottom string is zero. D. none of the above
The per-ton cost of waste disposal is projected to continue to rise as fewer acceptable sites for waste disposal become available.
Answer the following statement true (T) or false (F)
Thunder and lightning are associated with the ________ cloud
A) nimbostratus B) cirrostratus C) cumulonimbus D) altostratus E) cirrus
Which of the following is an example of a product found in a "throwaway society," such as the United States?
A. paper napkins B. reusable cloth diapers C. reusable razor blades D. fine silverware