Uruguay has major deposits of:
A) gold
B) silver
C) manganese
D) iron
D
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Intrusive igneous rocks are, in general, ____
a. coarse-grained b. clasts c. regolith d. chemical precipitates e. rapidly cooled
What is the main cause of uplift during a continental collision?
A. an almost doubling of the thickness of continental crust B. down flexing of one continent in front of thrust belts C. thinning of the lithosphere D. addition of magmas from the subduction zone
What is meant by the term "contamination?"
A. The concentration of a toxic substance is above natural levels. B. The concentration of a toxic substance is harmful to humans. C. The concentration of a toxic substance is harmful to all organisms. D. The concentration of a toxic substance is not above natural levels.
In a volume of air near the earth's surface, __________ occupies 78 percent
and __________ nearly 21 percent. a. nitrogen, oxygen b. hydrogen, oxygen c. oxygen, hydrogen d. nitrogen, water vapor e. hydrogen, helium