If the capacity of a stream is exceeded, _________ will occur.
A) downcutting
B) erosion of valley walls
C) aggradation
D) both A and B
Answer: C) aggradation
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What is the present level of CO2? What would it be if it were 50% greater?
What will be an ideal response?
Lichens play a special role in chemical weathering by
A) weakening the hydrogen bond in water, making it more effective at dissolving rocks with high quartz concentrations. B) slowing the rate of jointing in rocks. C) acting as a catalyst for the dissolution of minerals that crystallize at the highest temperatures. D) secreting oxalic acid, which dissolves carbonates particularly well.
An approaching wave cyclone would be indicated by a ________ barometer reading
A) high B) variable, rising then falling C) slowly rising D) very low E) rapidly falling
Given the following information determine which of these acids is the weakest? Ka for boric acid is 7.3 x 10^-10 pKa of acetic acid is 4.75 Ka for lactic acid is 8.4 x 10^-4 pKa of phenol is 9.89
A) acetic acid B) formic acid C) lactic acid D) phenol