Which of the following is not a natural factor that helps reduce air pollution?
a. Wind
b. chemical reactions
c. salty spray from the oceans
d. a sunny, warm, and dry climate
e. rain and snow
D
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Oak, hickory, maple, poplar, and beech are typical tree species in the
a. boreal forest b. tropical rainforest c. temperate rainforest d. temperate deciduous forest e. coastal coniferous forest
Coal is composed of
A. a combination of oil-rich sediments and calcareous ooze. B. petrified wood. C. buried plant material that has partially decayed. D. buried animal material that has partially decayed.
Evaporation of water
A) requires a lot of energy, since the latent heat of evaporation is high. B) decreases with increasing wind speed. C) is fastest over cold surfaces. D) increases as the relative humidity increases. E) increases when the atmospheric pressure is high.
Paleomagnetic evidence has provided support of the ideas that:
a. new oceanic crust is created at mid-oceanic ridges and moves outward from the ridges b. mountain ranges have low-density roots c. the outer part of the earth's core is liquid d. none of the above