During the first 20 years of recycling (from 1960 to 1980), the average annual increase in recycling was approximately ________.
A) 80 million tons/year
B) 1 million tons/year
C) 20 million tons/year
D) 10 million tons/year
E) 8.0 million tons/year
Question 2
Conservation biologists define a region as a biodiversity hotspot if ________.
A) there is an endemic species protected by a captive breeding program
B) species richness is unusually high and protection is required
C) there is an unusually large number of endemic species threatened by humans
D) there is an unusually large number of endemic species thriving
E) there is at least one umbrella species to be protected
This older woman is exploring new avenues of enjoyment as she avoids stagnation in her later years
The Last 10,000 Years of Greenhouse Gas Concentrations
Average Hourly Earnings of U.S. Workers in Current and Constant Dollars
Saving and Investment Rates of Industrialized Countries, 1960–1974
The 1980 Mount Saint Helens eruption obliterated the community at the base of this Cascade volcano.
Earth 150 Million Years Ago