Describe two natural factors that help remove pollutants from the air.
Fill in the blank(s) with the appropriate word(s).
Five natural factors help reduce outdoor air pollution. First, gravity causes particles heavier than air to settle out. Second, rain and snow partially cleanse the air of pollutants. Third, salty sea spray from the oceans washes out many pollutants from air that flows from land over the oceans. Fourth, winds sweep pollutants away and dilute them by mixing them with cleaner air. And fifth, natural chemical reactions remove some pollutants. For example, SO2 can react with O2 in the atmosphere to form SO3, which reacts with water vapor to form droplets of H2SO4 that fall out of the atmosphere as acidic precipitation.
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A permeable rock mass must be porous (or fractured), but a porous rock mass may not necessarily be
permeable. Indicate whether the statement is true or false.
On large-scale maps, equivalence and conformity can be ________
A) simultaneously present B) simultaneously approximated for small areas C) disregarded if the map is of high latitudes D) considered to be the same map property
Many areas now have ________ plantations, in which trees are planted and harvested as crops (much as we do in agriculture), although on cycles of a few decades rather than just a single year
A) crop rotation B) harvestable crop C) sustained yield D) yield management E) partial extraction
In a system, fish feed on shrimp that feed on the bacteria. This food chain represents a
A) tertiary consumer eating a secondary consumer, which eats a primary consumer. B) primary consumer eating a secondary consumer, which eats a tertiary consumer. C) consumer eating a producer, which then consumes chemoautotrophic bacteria. D) second order consumer eating a first order consumer, which then eats a producer.