The two-stage ditch design was created in order to
A) drain wetlands and provide more agricultural land.
B) combine agricultural areas with aquaculture of fish.
C) allow ditches to drain off excess water from croplands but also avoid erosion during heavy rains.
D) bring water from distant rivers and lakes to drylands in the process of desertification.
C
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Which of the following would be most useful in investigating groundwater contamination?
A) Records of how much material the company may have spilled B) Records of health problems, like leukemia, of people living in the area C) A map showing contours of the water table and of contamination levels D) A geologic map
Deep-focus earthquakes happen at _____.
a.) hot spots b.) divergent plate boundaries c.) convergent plate boundaries d.) transform plate boundaries
Which of the following statements about fusion is true?
A. Fusion produces no harmful radiation. B. Fusion is easier than fission. C. Fusion reactions have no critical-mass requirement. D. Fusion reactions can be easily controlled to make energy. E. none of the above
Why is stratospheric ozone important to humans?
What will be an ideal response?