The period of time not represented by strata in an unconformity is a hiatus
a. True
b. False
True
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An amino acid is an organic molecule that contains both an amine group and a carboxyl group. At an acidic pH, which structure is most likely?
A. Structure (a) B. Structure (b) C. Structure (c) D. All three structures are equally possible.
What percentage of all wetlands has been lost to human disturbance?
A. 90% B. 50% C. 75% D. 25%
Mass extinctions at the end of the Ordovician occurred because of
a. dramatic changes related to glaciation. b. dramatic chemical changes in seawater related to meteorite impact. c. increased solar radiation. d. decreased solar radiation. e. none of the above
You visit a small village during a trip to Haiti. Which of the following would you be most surprised to find them using for cooking?
A) Dried animal dung B) Coal C) Charcoal D) Wood