The Principle of _____ states that in an undeformed sequence of sedimentary rocks, each bed is older than the one above and younger than the bed below.
A) Sequence Stratigraphy
B) Vertical Continuity
C) Original Horizontality
D) Superposition
Answer: D) Superposition
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Tropical rain forests cover about ____ of the earth's surface, but contain at least ____ of the known terrestrial plant and animal species.
A. 2%; 50% B. 10%; 50% C. 2%; 20% D. 30%; 30% E. 50%; 50%
Which of the following is an inflow to an urban ecosystem?
A) polluted water B) polluted air C) heat D) natural resources E) solid waste
Radar gathers information about precipitation in clouds by measuring the ____
A) energy emitted by the precipitation particles B) absorption characteristics of falling precipitation C) amount of energy reflected back to a transmitter D) amount of sunlight scattered off the precipitation
Recently, the major causes of acid-generating emission has shifted from
A) nitrogen oxides to sulfur oxides. B) sulfur oxides to nitrogen oxides and ammonia. C) carbon dioxide to carbon monoxide. D) ozone and PANs to VOCs.