The thermocline defines the ___________, and the pycnocline defines the ___________
a) Area where the water density rapidly changes; area where the temperature rapidly changes
b) Area where the water temperature rapidly changes; area where the water density rapidly changes
c) Area where the temperature of the water is at equilibrium; the density of the water is at equilibrium
d) Area where salt concentration rapidly changes; area where oxygen rapidly changes
B
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The frequency of an electric razor in Europe that completes 50 vibrations in 1 s has a frequency of
A. 50 Hz with a period of 1/50 s. B. 50 Hz with a period of 50 s. C. 1/50 Hz with a period of 50 s. D. 1/50 Hz with a period of 1/50 s.
The average user in Germany upgrades their cellphone every (almost) 4 years, and every 6 1/2 years in Brazil. In the U.S., the average user upgrades their cell phone every
A) less than 2 years. B) 4 years. C) 6 years. D) more than 8 years.
Despite their rigidity rocks bend and fold but when stressed far enough, they fracture along cracks called:
A) fractures B) faults C) plate boundaries D) epicenter E) center of stress
An object that radiates more energy than it absorbs will ____
A) become colder B) become warmer C) maintain the same temperature D) reach radiative equilibrium