Air is often much cleaner after a rain primarily because
A) droplets and crystals scavenge particulates.
B) particulates act as condensation nuclei.
C) gravitational settling works faster when the air is saturated.
D) the lower temperature increases the efficiency of automobile engines.
Answer: A
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High rates of respiration by organisms in particular regions of the ocean can lead to ____________, or a depletion of
oxygen.Fill in the blank(s) with the appropriate word(s).
According to the peripheral model, an urban area consists of an inner city surrounded by
A) large industrial parks far removed from any residential neighborhoods. B) small clusters of suburban malls and run-down shanties (shacks). C) large suburban residential and business areas tied together by a beltway or ring road. D) wealthy residential neighborhoods with no access to the inner city. E) a beltway of connected roads all leading to small rural areas where the rich live.
Walking along the woods, a student spot a lizard that quickly runs under some leaves that are resting on the forest floor. Looking under the leaves to find the lizard, he notices that the soil is very moist despite several days without rain
This moist soil layer under the leaves is a result of A) humus with a high water-holding capacity and reduced evaporative loss in the O horizon. B) sand with a high water-holding capacity with water supplied from the B and E horizon. C) low infiltration and high evaporative loss in the B horizon. D) a low water-holding capacity of the lower soil layers and high evaporation through the top soil layers.
Brazil's ________ was the major destination for Europeans
A) Northeast B) West C) East D) Central region E) South