Blood lead levels in children between 1996 and 2012 have
A) increased steadily despite EPA and CDC programs to eliminate lead from the environment.
B) continued to decrease as exposure to lead has been reduced.
C) remained about the same.
D) increased in rural areas but declined in urban areas with heave vehicular traffic.
B
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Spreading centers on continental plates ____.?
a. ?spread much faster than spreading centers on oceanic plates and create rift zones b. ?spread much slower than spreading centers on oceanic plates and create rift zones c. ?are identical to spreading centers on oceanic plates d. ?spread much faster than spreading centers on oceanic plates but do not create rift zones e. ?spread much slower than spreading centers on oceanic plates but do not create rift zones
Figure 6.3 depicts precipitation forming by the:a
ice crystal process.
b. collision-coalescence process.
c. cloud seeding
Lines connecting points of equal temperature on maps or cross sections are called ________.
A. isochrons B. isohyetal curves C. isotherms D. thermochrons E. isopleths
The two types of dry (B) climates are desert and ________
A) steppe B) taiga C) tundra D) highland