Plants introduced into new habitats in which they were not originally raised are ________
A) feral
B) taiga
C) exotic
D) anadromous
E) selva
Answer: C
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Subsidence in the Gulf coast is mainly due to ____
A) ?tectonic activity B) ?emptying of a volcanic chamber C) ?coastal erosion D) ?sediment compaction
What theory explains the formation of a differentiated Earth consisting of layers?
A)Darwin's theory B)plate tectonic theory C)Einstein's Theory of Relativity D)homogeneous accretion theory E)Big Bang
Annual row crops such as ________ cause the highest erosion rates because ________.
A. Wheat and coffee; they need so much water B. Beans and coffee; trees are usually cut down for the fields C. Tea and beans; plowing in the fall is required for planting of these annual spring crops D. Corn and coffee; they use so many nutrients E. Corn and beans; soil is left bare for the majority of the year
Which of the following has NOT been a result of the introduction of the Wello WaterWheel in rural India?
A) a reduction in neck and back problems among women B) an increase in female literacy C) a decrease in the school dropout rate among young girls D) an increase in the amount of water available for agriculture E) a reduction in the number of hours a week spent carrying water