The absence of a layered structure in the clay-rich soil pictured below occurs because
A. volcanic ash has penetrated very deeply beneath the surface in this soil type.
B. calcification has caused caliche to be left behind in all of the horizons.
C. leaching is so strong that it removes the distinguishing features of each layer.
D. swelling as the soil absorbs water and shrinking as it dries out removes the horizonation.
Answer: D
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Fill in the blank(s) with the appropriate word(s).
In less-developed countries, the poorest urban dwellers live on the outskirts of large cities in shelters made out of metal scraps, plastic and cardboard. What are these areas of the city called?
A. shantytowns B. patio houses C. condominiums D. rooming houses
Which of the following best matches the description?Physical and chemical processes involved in the breakdown of parent material into soil.
A. soil texture B. leaching C. mechanical weathering D. chemical weathering E. windbreak F. lithosphere G. humus H. contour farming I. asthenosphere J. terrace K. weathering L. loam M. soil structure N. horizon O. soil profile P. parent material Q. friable
Which two main factors determine the resisting strength that occurs in a mass movement?
A) rock roughness and density B) friction and rock roughness C) rock density and cohesion D) rock friction and cohesion