Climate change and human activity like overgrazing of grasslands is leading to large areas subject to "desertification" where native grass cover dies out during drought periods, exposing soil to erosion
What is potentially the greatest initial soil erosion potential during this type of an event?
A) local gullying produced by intermittent rain storms
B) loss of topsoil by wind erosion on a large scale
C) sand blown in from adjacent deserts
D) growth of shrubs shading the ground, further killing the grasses
B
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In alley cropping,
A. crops are planted between rows of trees or shrubs that are used for fruit or firewood. B. terraces are built to prevent swift water runoff. C. plowing runs across slopes. D. special tillers are used so the topsoil is not disturbed. E. a small series of dams are built.
Fundamental to semiconductors are
A. bound electrons. B. free electrons. C. both of these in various proportions D. none of the above
The hymenoptera family of insects includes ___________, which usually cause death secondary to ___________.
A) spiders, acute heart failure B) yellow jackets, anaphylaxis C) snakes, severe coagulopathy D) centipedes, central nervous system depression
The climates of the United States and Canada include the __________________ climate.
-desert Type B -tropical Type A -seasonal continental Type D -moderate/humid Type C -all of these are found in the region