Which of the following is a common setting for a spring?
A. a permeable upper layer with a water table deep below the surface
B. an unconfined aquifer with a water table deep below the surface
C. a nonpermeable upper layer with a water table deep below the surface
D. a limestone aquifer that intersects the surface
Answer: D
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What percentage of species do scientists predict we will drive to extinction by the year 2100?
A. 25-50% B. 5-10% C. 0% D. 75-100%
Migrating midlatitude anticyclones typically
A) move easterly driven by the prevailing westerlies. B) move westerly driven by the prevailing westerlies. C) move easterly driven by the prevailing easterlies. D) move westerly driven by the prevailing easterlies.
Fossils of Archaeopteryx are important because they ____
a. prove that dinosaurs could fly b. indicate birds may have evolved from theropod dinosaurs c. indicate theropod dinosaurs may have evolved from birds d. indicate some dinosaurs were warm-blooded e. show that small dinosaurs had feathers
Russian forces often employed a defensive tactic know as ______ _______ (all resources: crops, roads, buildings, etc were destroyed as the opposing army advanced) to protect the motherland
Fill in the blank(s) with correct word