What percentage of the world's population is in the United States, and what is its share of world economic output?
A) 3% of population; 12% of output
B) 5% of population; 25% of output
C) 9% of population; 20% of output
D) 15% of population; 40% of output
E) 20% of population; 50% of output
B
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Where in the open ocean are phytoplankton the most productive?
a. open tropical ocean b. temperate continental shelves c. northern polar ocean
d. open equatorial ocean e. enclosed seas
What is the net force of inertia and gravitational attraction combined?
a. gravitational forces b. centrifugal forces c. inertial forces d. centripetal forces e. tractive forces
Violent causes of death from volcanic eruptions include ________.
A. lahars B. poison gases C. tsunami D. pyroclastic flows E. All of these choices are correct.
The highest tides occur when the ________
A) Earth and Moon are lined up B) Earth and Sun are lined up C) Sun and Moon are lined up D) Earth, Sun, and Moon are lined up E) Earth and Moon are lined up and the Sun is at a 90-degree angle