Construction of a dam results in
A. increased erosion by clear water released from the dam.
B. an increase in the total amount of water flowing downstream of the dam.
C. the dam releasing water that contains more sediment than carried by the river before the dam was constructed.
D. increased erosion where the stream channel meets the reservoir.
Answer: A
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In the healthy environment of a sustainable soil,
A) the levels of humus steadily decline, but the aeration increases. B) sandy or silty soils are steadily converted to clay soils. C) abundant populations of bacteria are steadily replaced by mycorrhizae. D) the humus-forming processes of topsoil is renewed by the addition of detritus and humus.
We can all help sustain terrestrial biodiversity through various measures. Which of the following methods is least effective in sustaining biodiversity?
A. Plant trees and take care of them. B. Recycle paper and use recycled products. C. Buy sustainable wood and wood products. D. Help restore nearby degraded forests or grasslands. E. Eliminate local plants from your household garden.
The rapid sinking of a large area of land above an aquifer is known as ________
A) a recharge zone B) a sinkhole C) subsidence D) saltwater intrusion E) a discharge zone
The Happy Planet Index assesses nations in various regions of the world for "sustainable well-being" by measuring the happy life years of citizens and the ecological footprint made by their resource consumption. Find the nation on the graph whose citizens experience about 43 happy life years and have an ecological footprint of over 6 hectares per capita. Which region is this nation found in?
a. East Asia b. Middle East c. Latin America d. Western world