Oxygen, silicon and aluminum are the three most abundant chemical elements within earth's crust. Why, then is aluminum recycled?
A. even though aluminum is abundant in the crust, most of it is within seafloor crust and consequently difficult to obtain
B. to reduce the consumption of electrical energy relative to that which is needed to extract aluminum from ore
C. because aluminum is a precious metal
D. All of these reasons are true.
Answer: B
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An inversion is extremely stable because
A) the environmental lapse rate is very small B) the environmental lapse rate is zero C) the environmental lapse rate is very large D) there is no environmental lapse rate
Plate movement plays a major role in the present non-random distribution of plants and animals
Indicate whether the statement is true or false
During the Archean, how long was the length of a day on Earth?
A)36 hours B)10 hours C)The same as the length of a day on modern Earth D)The same as in the present but with no sunlight, i.e., all darkness E)The same as in the present but there no darkness, i.e., all daylight
Which of the following is a not a primary amine?
A) Benzedrine B) Fastin C) Methedrine D) None, they are all primary amines.