Which of the following sustainable factors helped to save America's forests from destruction during
the 20th century?
a. conservation of forests by creation of the National Forest Service
b. technology driven mass production of construction materials from plastics
c. economic policies that allowed the importation of wood from tropical rainforests
d. conservation efforts that resulted in a reduction in the demand for wood products
e. overall decline in the United States population
A
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According to the U.S. Environmental Protection Agency, one of the five top toxic substances of major concern to human and environmental health is
A. sodium. B. lead. C. oxygen. D. gold. E. polonium.
As a source of energy, developed countries rely on ________ the most, while developing countries rely more heavily on ________
A) fossil fuels; nuclear power B) wood and other biofuels; fossil fuels C) coal; oil and natural gas D) oil and natural gas; coal
A hanging valley _____
a. is a stream valley that was adjacent to glaciers, but was never glaciated b. marks where a glacier extended below sea level c. blocked the flow of one or more glaciers d. once contained a tributary glacier e. is a glaciated valley that was later uplifted by tectonic forces
The type and amount of material carried in the suspended load of a stream depends on ________
A) source accessibility and slope B) settling and flow velocities C) flow velocity and discharge D) ground cover and channel shape E) turbulence and viscosity