The 2008 and 2012 projections for U.S. population growth are significantly greater than projections made in 1989 because the more recent projections include
A) a higher fertility rate.
B) higher levels of immigration.
C) higher fertility rates and higher levels of immigration.
D) higher rates of infant mortality and emigration.
C
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Which of the following is a correct statement about ocean currents?
A. They are warmest in the mid-latitudes. B. They are typically colder than the water 1 km below. C. They are not involved in La Niña events. D. They initiate Ekman spirals.
What is the difference between a mineral and an element?
What will be an ideal response?
Most natural phenomena we wonder about
A) involve several scientific disciplines. B) are best explained by physics. C) require knowledge of advanced mathematics. D) are poorly explained by science.
Folded layers of rock can form a wavelike pattern of troughs and crests. The layers near the crest (i.e. the upward fold) form
A) a syncline. B) an anticline. C) a tension zone. D) shear. E) a thrust fault.