All parts of Alaska have 12 hours of daylight on the
A) summer solstice and vernal equinox.
B) vernal equinox and the autumnal equinox.
C) autumnal equinox and summer solstice.
D) summer solstice and winter solstice.
E) winter solstice and the vernal equinox.
B
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Compressions and rarefactions travel
A. in the same direction of the wave. B. at right angles to the wave. C. in opposite directions of the wave. D. none of the above
Which of the following has been used to reconstruct past climates?
a. analysis of air bubbles trapped in ice b. study of documents describing floods, droughts and crop yields c. the ratio of oxygen 18 to oxygen 16 in the shells of marine organisms d. study of geologic formations e. all of the above
One of the main roles of plants in biogeochemical cycles is to
A. harden the soils. B. decrease the amount of time that water remains in contact with rocks and soils. C. reduce the rate of weathering. D. extract carbon dioxide from the atmosphere.
What three countries can be viewed from the "Golden Triangle"?
A) Burma, Thailand, Laos B) Burma, Vietnam, Laos C) Vietnam, Laos, Cambodia D) Vietnam, Burma, Cambodia E) Thailand, Cambodia, Laos