Which air mass has its source region in the southwestern United States?
A. mP
B. mT
C. cT
D. cA
E. cP
C
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____ plants came to dominance in the Cretaceous
A)Land B)Leafy C)Green D)Flowering E)Tall
If a rock started with 1,000 atoms of a parent but now contains 250 atoms, how many half lives have passed?
A. .25 half lives B. 2 half lives C. .5 half lives D. 1 half life E. There is no way to tell.
Tillite indicates ________.
A. recent glacial deposition B. ancient glacial erosion C. ancient glacial deposition D. recent glacial erosion
Which statement about deserts is most accurate?
A)Evaporation exceeds precipitation in arid and semi-arid regions. B)Loess deposits are common in deserts. C)The geologic process at work in deserts are vastly different from those at work in humid regions. D)Deserts do not have seasons, and they are uniformly hot year-round. E)Deserts occur where atmospheric pressure is low.