Which of the following processes is not considered physical weathering?
A) Near-surface fracturing
B) Frost wedging
C) Prying by plant roots
D) Thermal expansion
E) Oxidation
E) Oxidation
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The soil shown in the photograph below has a greenish or grayish tint, which may mean that
A) it has abundant aluminum and/or iron oxides.
B) it contains abundant organic matter.
C) it has been waterlogged at some point.
D) there are salts or other minerals that have been deposited by the evaporation of water.
A method of increasing water supplies that has been successful, but expensive is
A. Altering the climate's convection currents B. Towing icebergs by ship from polar regions C. Desalination D. Cloud seeding E. None of these is correct.
Economists look at resources as the available supply of something that can be used.
Answer the following statement true (T) or false (F)
In the U.S., ambient air concentrations of which of the following have declined the most since 1980 compared to its health and safety standard?
A) lead B) NO2 C) ozone D) SO2 E) CO