The longitudinal profile of a stream:
a. extends across a channel at right angles to the banks.
b. extends from source to mouth.
c. is used to calculate cross-sectional area.
d. is determined from a hydrograph.
e. is determined by stream ordering.
B
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During an action potential, a neuron's membrane potential
A. decreases as sodium ions flow into the neuron. B. increases until it reaches threshold, then decreases. C. may or may not reach threshold. D. increases until it reaches threshold, then spikes.
What is one way for an unconformity to develop?
a. erosion b. deposition c. transgression d. regression e. lithification
The average length of a period during which a given magnetic field polarity exists is about
A) 10,000 years. B) 100,000 years. C) 500,000 years. D) 1,000,000 years.
Which of the following slope failures is most likely to cause large numbers of casualties?
A. creep B. rotational slide C. debris slide D. rock avalanche E. earth flow