How do soils that form in humid regions differ from soils that form in semi-arid regions in the
environments in which they form and in their basic characteristics? What will be an ideal response?
Soils that form in semi-arid regions contain less organic matter than the soils of more humid areas, so
horizon A is lighter colored and contains more unstable minerals because of less intense chemical
weathering. Calcium carbonate precipitates in horizon B, forming caliche, as soil water evaporates.
Soils that form in humid regions have most of the soluble minerals are leached from horizon A, but
that horizon contains abundant organic matter. Aluminum-rich clays and iron oxides tend to
accumulate in horizon B.
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How can spraying DDT prevent the spread of malaria?
A. DDT prevents dehydration. B. DDT is a teratogen. C. DDT bioaccumulates at high trophic levels. D. DDT is a pesticide that kills mosquitos. E. DDT follows the precautionary principle.
After the fragmentation of Rodinia, it reassembled to form another supercontinent, ____
a. Nuna b. Kenorland c. Vaalbara d. Laurentia e. Pannotia
Which of the following best matches the description?Layer of soil and rock that covers deposits of desirable minerals.
A. active solar system B. liquefied natural gas C. underground mining D. overburden E. acid mine drainage F. surface mining G. resources H. reserves I. black lung disease J. renewable energy sources K. nonrenewable energy sources L. geothermal energy M. secondary recovery N. photovoltaic cell O. passive solar system
The soil structure resulting from the castings of earthworms
A) improves the infiltration and aeration of soil. B) decreases the infiltration and aeration of soil. C) decreases the nutrient-holding capacity of soil. D) improves the nutrient-holding capacity but decreases the aeration of soil.