A large flood in a river may cause abrupt shifts leading to the carving of a new channel. The point at which this change occurs is a(n)
A) type of dynamic equilibrium condition.
B) type of metastable equilibrium.
C) threshold.
D) input.
C
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Which of the following occurs during a major El Niño event?
A. Peruvian fishermen harvest a record amount of fish near Christmas time. B. British Columbia experiences severe drought conditions. C. The northeast trade winds increase in strength. D. Ocean warming is extensive over the tropical Pacific.
Air masses that form over northern Siberia are most likely to be ________ air masses
Fill in the blank(s) with the appropriate word(s).
Which of the following is true of cytokines?
A) They are lipoproteins. B) They are produced by one cell but alter the function of another. C) both a and b D) neither a nor b
How do rainfall and snowmelt trigger mass movements?
What will be an ideal response?