Refuse-derived fuel differs from normal garbage in that it
A. Is sorted
B. Has agricultural wastes
C. Is selectively collected
D. Has coal added
E. Is unsorted
Answer: A
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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.
Pleistocene glaciers produced bowl-shaped depressions on mountains called _______. Fill in the blank(s) with the appropriate word(s)
A "mystery" in our understanding of plate tectonics has been, until recently, the nature of the power source capable of moving the plates and the continents embedded within them. Recent evidence indicates the power source to be ____
A) the readjustment of the surface to continual shrinking of the whole Earth B) convection currents within Earth's mantle moving the plates C) the action of ocean currents dragging along the seafloor, causing the seafloor and the continents to move D) the continual vibration from earthquakes and volcanoes slowly moves the continents equator-ward under the influence of centrifugal force
One kind of convergent plate boundary is ________.
A. rift valley convergence B. transform convergence C. continent-continent convergence D. subduction zone convergence