Migmatite ____
A)is produced during the lower temperature range of metamorphism
B)is a nonfoliated rock
C)never occurs due to regional metamorphism
D)always shows rotational metamorphism
E)has both igneous and metamorphic characteristics
E
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Short-grass prairies ____
a. are often cultivated without irrigation b. grow in areas where the subsoil is permanently dry c. cannot support grazing animals d. tend to coincide with areas of tropical monsoon climate e. only occur in the Southern Hemisphere
A climate classifications based on the interaction of air masses is an example of an empirical classification
Indicate whether the statement is true or false
The concept that the earth was a sphere was not known until the Renaissance, in Columbus's time
Indicate whether the statement is true or false
Assume that these categories represent a progression of degradation through time. In other words, if left unchecked, lightly degraded soil progresses into moderately degraded soil and so forth. Which continent poses the greatest concern for future loss of agricultural productivity?
a. South America b. North America c. Africa d. Europe e. Asia