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.
C) it has been waterlogged at some point.
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If the recommendations of the U.S. National Academy of Sciences were followed, which priority level for treating solid waste would incineration fall into?
A. last B. first C. second D. none
The actions of ____________________ and ____________________ are responsible for most soil
erosion. Fill in the blank(s) with the appropriate word(s).
Which fire detection method is NOT currently in use?
a. automated smoke detection systems mounted on tall towers b. light aircraft with heat detection cameras c. manned forest towers d. weather radar e. hot-air balloons with heat detection cameras
The lag in daily temperature refers to the time lag between the
a. ?time of maximum solar radiation and the time of maximum temperature. b. ?time of minimum temperature and the time of maximum solar radiation. c. ?minimum and maximum temperature for a day. d. ?minimum and maximum solar energy received at the surface for a given day. e. ?sunrise and sunset.