What process thins the continental crust before it meets the oceanic crust at the continental slope?
A. subduction
B. normal faulting
C. sediment deposition
D. river erosion
Answer: B
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A volcanic dike would be most likely to illustrate this geologic principle.
A. principle of cross cutting relations B. principle of superposition C. principle of original horizontality
The 1994 Northridge event was similar to the 1971 San Fernando earthquake in magnitude, number of people killed, and type of faulting.
Answer the following statement true (T) or false (F)
Identify the four seawater constituents that are present in the highest concentration.
A. sodium B. potassium C. sulfate D. bromide E. chloride F. magnesium G. calcium
What conclusions can you make from examining the graph? 
A. Ecosystem "c" is used by humans about twice as much as ecosystem "d". B. Ecosystem "a" has the most threatened plant species. C. Ecosystem "a" has the most biodiversity. D. Humans use ecosystem "a" much more than ecosystem "b". E. None of these conclusions is supported by the data.