The Earth's present magnetic field is described as "normal," meaning that the north magnetic pole is located ____, and
the south magnetic pole is located ____.
a. at the south geographic pole; at the north geographic pole
b. in the Antarctic; in the Arctic
c. at the north geographic pole; at the south geographic pole
d. in the southern hemisphere; in the northern hemisphere
e. at the highest altitude; at the lowest altitude
c
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Following the rank-size rule, if the population of the largest city in a country or region is 1 million, the fourth-largest city should contain about this many people
A) 500,000 B) 400,000 C) 250,000 D) 133,000 E) 100,000
Fossils of Archaeopteryx are important because they ____
a. prove that dinosaurs could fly b. indicate birds may have evolved from theropod dinosaurs c. indicate theropod dinosaurs may have evolved from birds d. indicate some dinosaurs were warm-blooded e. show that small dinosaurs had feathers
Air that contains as much water as it can hold:
A) is very heavy. B) cannot be lifted very high. C) is saturated. D) has a very low relative humidity.
An object at radiative equilibrium temperature is behaving as a ____
A) selective absorber B) blackbody C) light reflector D) greenhouse gas