Organic acids can chemically weather a rock. Where would these acids originate?
A) Decay of granite
B) Thermal reaction between water and limestone
C) Secretion from and decay of vegetation
D) Leaching from the E horizon
Answer: C
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Which of the following are erupted by volcanoes?
A) Lava B) Ash C) Pumice D) All of these are correct.
Discuss the geothermal gradient. What is it? What causes it? What are its limitations?
Which of the following is the mechanism of peptide bond formation during protein synthesis?
A) Nucleophilic attack on the carbon of a carbonyl group by an amino group. B) Nucleophilic attack on the nitrogen of an amino group by the carbon of a carbonyl group. C) Nucleophilic attack on the nitrogen of an amino group by the oxygen of a carbonyl group. D) Nucleophilic attack on the oxygen of a carbonyl group by an amino group.
The highest temperatures in the atmosphere occur in the
A) mesosphere. B) troposphere C) thermosphere. D) stratosphere.