Some reactions are more sluggish than others. To speed up these reactions and save energy, a(n) ________ is sometimes added.
A. catalyst
B. activator
C. reaction profile
D. exotherm
E. heat source
Answer: A
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Compared to high-input industrialized monoculture, low-input polyculture ____.
A. produces lower yields with less energy per unit of yield B. produces similar yields with less energy per unit of yield C. produces higher yields with less energy per unit of yield D. increases topsoil erosion E. produces greater amounts of greenhouse gases
The term anaerobic means:
A) highly acidic. B) without motion. C) under extreme pressure. D) without air (or oxygen).
The book Silent Spring, by Rachel Carson, described progress in reducing pollution and showed that pesticides like DDT were no longer a concern due to effective environmental programs.
Answer the following statement true (T) or false (F)
What gas is in the largest quantity when released in a volcanic eruption?
A. carbon dioxide B. sulfur dioxide C. water vapor D. fluorine E. hydrogen sulfide