The "A" horizon or combined "O/A" horizons of the soil are known as the ________
A) subsurface horizon(s)
B) illuviation layer(s)
C) epipedon
D) regolith
E) colloidal layer(s)
Answer: C
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What major effect has the Argentina fire ant had on southeastern ecosystems?
A. They wipe out native ants. B. They take up mounds of dirt around their holes. C. They sting people. D. They provide food for armadillos. E. They eat food supplies of other insects.
If total fertility rates are decreasing, why is the world's human population still increasing?
What will be an ideal response?
How does fossil evidence support continental drift?c What will be an ideal response?
In developed countries, the two most deadly sources of indoor pollution are ________
A) radiation from electronic equipment and pesticides B) pesticides and cigarette smoke C) radon and cigarette smoke D) synthetic furniture materials and radiation from electronic equipment E) pesticides and cleaning agents