A major characteristic of graded bedding is that the rock layers ____
A)are thick and easily distinguished from each other
B)formed because turbidity currents are less dense than sediment-free water
C)contain intersecting fractures called mud cracks
D)show an upward decrease in grain size
E)are always formed in deserts
D
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The transformation of snow into glacial ice in Antarctica takes ________ than in midlatitude alpine glaciers because ________
A) less time; more snow fall in the polar regions each year slows the glacier formation process B) less time; there is more melting and refreezing in the midlatitudes and, therefore, it takes much longer there C) longer; the long summer days in Antarctica (up to 24-hours) results in more sunlight impeding the glacier development process D) longer; the dryness of the Antarctic climate and minimal snowfall as compared to wetter climates with constant snowfall
Which ship was involved in the first global, comprehensive study of the Earth's oceans starting in 1872?
A) U.S.S. Cyclops B) H.M.S. Challenger C) R.M.S. Titanic D) The Glomar Explorer
When the Sun is 4° above the horizon, sunlight must pass through an atmosphere more than ____ times thicker than when the Sun is directly overhead
a. ?2 b. ?5 c. ?8 d. ?12 e. ?20
The current number of internally displaced persons within sub-Saharan Africa is approximately
A) 2 million B) 11 million C) 5 million D) 75 million E) 1 million