What is the name for slow, deep currents beneath the pycnocline?
a. Surface currents
b. Convection currents
c. Thermohaline currents
d. Polar currents
ANS: C
Thermohaline currents are dependent on density differences which stem from temperature and salinity
variations. These and surface currents have large impacts on Earth's temperature, climate and
biological activity. Information can be found in the section Mass Flow of Ocean Water Is Driven by
Wind and Gravity.
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Which of the following is NOT a typical environment in which a metamorphic rock forms?
A. solidification of lava B. squeezing by tectonic forces C. heating adjacent to underground magma D. burial to great depths
What is perestroika?
A) greater openness, a policy in the 1980s that encouraged several republics to demand independence B) planned economic restructuring, an early move toward a freer market C) a policy of education improvement, in the last days of the former Soviet Union D) the Russian word for railroad E) a type of permafrost found around Glasgow
The ammonium ion has the formula NH4+. How many electrons must be shown in the Lewis structure of the ammonium ion?
A) 4 B) 5 C) 8 D) 9
What kind of information can be determined about the ocean with the use of satellites?
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