Humus:a
is the material always comprising the topmost soil horizon.
b. is dark, organic-rich material formed by bacterial decay.
c. is leaf-litter.
d. must include sediments.
e. none of the above
B
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What can be caused by ENSO events in the eastern Pacific?
a. Productivity increases due to high nutrient upwelling. b. Water temperatures decrease. c. Drought conditions occur. d. Water levels decrease. e. Upwelled water is nutrient-depleted, causing loss of productivity.
How do porosity and permeability change with depth below the surface? Which Earth materials have the highest porosity and permeability? The lowest?
What will be an ideal response?
The Native American __________ group left their mark on the land with a series of lines and markings carved into the sandy surface that date back 2,000 years ago
Fill in the blank(s) with correct word
Which of the following air masses shows the most dramatic change in both temperature and moisture content as it moves over a large body of very warm water?
A. mP in winter B. cT in summer C. cP in winter D. mT in summer