The absence of a layered structure in the soil pictured below occurs because
A) leaching is so strong that it removes the distinguishing features of each layer.
B) swelling as the soil absorbs water and shrinking as it dries out removes the horizonation.
C) calcification has caused caliche to be left behind in all of the horizons.
D) volcanic ash has penetrated very deeply beneath the surface in this soil type.
B) swelling as the soil absorbs water and shrinking as it dries out removes the horizonation.
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It can take 400 to 1,000 years to break down ____ that end up in landfills or the ocean.
A. disposable coffee cups B. batteries C. glass bottles D. plastic bags E. aluminum cans
Discuss the factors that determine whether a cloud can have a cooling effect or a warming effect on the atmosphere.
What will be an ideal response?
A constant rate of growth means not only increasing effects, but compounding effects, say some theorists. This Malthusian argument applies to which of the following?
a) Population b) Production c) Consumption d) All of the above
In general, as countries become more industrialized and developed,
A) use of contraception decreases. B) the cost of raising children decreases. C) people marry at an earlier age. D) support of the elderly increases.