Glacio-eustatic factors refer to
A) changes in the total amount of water on Earth.
B) a steady-state equilibrium in the water system.
C) changes in sea level related to the increase or decrease in quantities of ice.
D) changes in sea level related to the melting of icebergs.
C
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Which country is the leading source of immigrants to the United States?
A) China B) Mexico C) Spain D) Cuba E) Colombia
Which of the geologic principles listed here is incorrectly defined?
a. The principle of cross-cutting relationships states that the fault or intrusion that cuts across several rock layers is older than these layers. b. The principle of superposition states that in an undisturbed sequence of rock layers, the older layers are at the bottom of the sequence and the younger layers are at the top. c. The principle of lateral continuity states that sedimentary beds originate as layers that extend in all directions until they thin out at the edge. d. The principle of inclusions states that an inclusion within a rock layer is older than that layer. e. The principle of original horizontality states that sediment is initially deposited in a horizontal position.
The amount of radiation absorbed by tissues is measured in which of the following units?
A) curie B) gray C) roentgen D) all of them
Which process has been largely responsible for increasing the amount of CO2 in the last 200 years?
A) Increasing cattle ranching worldwide B) Disintegration of petroleum-based plastics C) Use of industrial fertilizers D) Burning of fossil fuels