Which of the following statements about electrons is true?
A) Electrons have a negative charge.
B) Electrons are particles.
C) Electrons behave like waves.
D) Electrons in atoms can be excited by light energy.
E) all of the above
E
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Which of the following are used by individual farmers to generate biogas for their own use?
A) Sugar, water, and anaerobic bacteria B) Cornstalks, ethanol, and aerobic bacteria C) Manure, water, and anaerobic bacteria D) Manure, water, and aerobic bacteria
Which of the following does Sen claim will NOT insure food availability?
a) Dependable food imports b) Land reform c) Steady employment d) Democracy
Scientists distinguish between situations that are merely correlated and those that are correlated and show
A. relationships.
B. cause-and-relation.
C. cause-and-effect relationships.
D. None of these are correct.
Which of the following is NOT a type of terrane in California?
A. displaced granitic rocks B. accretionary prism C. oceanic crust D. island arcs E. All of these are present in California.