What was a key concept introduced by American gun maker Eli Whitney?
A) copper wire (for electricity)
B) moving conveyor belt
C) lubrication for gears
D) interchangeable parts
E) rifled barrel
D
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A rain shadow is most likely to be produced by a
a. Forest b. Ocean c. Lake d. sand dune e. Mountain
All of the following are approaches to reducing eutrophication except ________
A) planting and maintaining vegetation buffers around ditches and streams that trap nutrient and sediment runoff B) upgrading stormwater systems to capture runoff from roads and parking lots C) applying fertilizers to farmland just before heavy rains are predicted D) using artificial wetlands to filter stormwater and farm runoff E) reducing fertilizer use on farms and lawns
What is the average life expectancy of people living in economically advanced countries?
A) 75 years and above B) 65 to 74 years C) 55 to 64 years D) 45 to 54 years E) less than 45 years
Currently, the fastest rate of seafloor spreading is thought to be on the order of ________
A) 0 centimeters per year (stopped) B) 10 centimeters per year C) 10 meters per year D) 100 meters per year E) 1 kilometer per year