Which sequence of rocks in the associated figures could result in a confined aquifer? (Low = low permeability and High = high permeability)
A. A
B. B
C. C
D. D
Answer: B
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Studies of the chemistry of rocks from arc volcanos indicate the main source of the magma is ________
A) melting of the asthenosphere above the subducting oceanic plate by frictional heating on the subduction interface B) melting of the subducted mantle lithosphere C) melting of the asthenosphere above the subducting oceanic plate by fluids acting as a flux to enhance melting D) melting of subducted oceanic crust
The hot circulating water at divergent plate boundaries metamorphoses basalt and gabbro, turning minerals within them to ________ minerals such as amphibole.
A. light-colored B. index C. hydrous D. stable E. nonsilicate
Political steps that can help reduce the destruction and degradation of tropical forests include all of the following except
a. certifying sustainably grown timber b. establishing programs to teach settlers sustainable agriculture and forestry strategies c. subsidizing only sustainable-use forestry d. encouraging migration to undisturbed tropical forests e. reducing poverty
In which Early Paleozoic continent was most of present-day North America located?
________________. Fill in the blank(s) with the appropriate word(s).