Which one of the following aquifers would be best for purifying groundwater that is contaminated with harmful sewage bacteria?
A. sand
B. coarse gravel with few small grains
C. highly fractured granite
D. cavernous limestone
Answer: A
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Which of the following describes the cause of thunder?
A. turbulent wind motions inside the thunderstorm B. collision between two thunderstorms with opposite electrical charge C. explosion occurring when positive and negative charges collide and neutralize each other D. rapid heating of air surrounding a lightning channel
Pure water is a(n): a. compound
b. atom. c. ion. d. element.
One significant difference between oceanic and continental crust in terms of the long term evolution of the earth's surface is that ________
A) continental crust is more uniform in composition than oceanic crust B) oceanic crust contains more radioactive elements that contribute to the heating of the earth. C) oceanic crust is less dense than continental crust D) oceanic crust preserves a history of ancient deformation better than continental crust E) continental crust is harder to subduct than oceanic crust
Which type of bacteria thrive in environments that lack free oxygen?
A) foraminifera B) placental C) aerobic D) anaerobic E) photosynthetic