The Aboriginal population numbered approximately ________ upon European conquest?
A) 200,000
B) 1 million
C) 800,000
D) 750,000
E) 300,000
E) 300,000
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A chimpanzee on a space walk tosses his hat away. Both the chimp and his hat will move
A. a short distance and then gain speed. B. away from each other, but at different speeds. C. away from each other at the same speed. D. a short distance and then slow down.
Most urbanization has taken place during the last hundred years
Indicate whether this statement is true or false.
Atmospheric shortwaves usually move __________ at a speed that is __________ than
longwaves. a. east to west, faster b. west to east, faster c. east to west, slower d. west to east, slower
The economics of solar electricity are
A) bleak because there is a large gap between the price of energy from coal and from PV cells. B) excellent for CSP technology but discouraging for PV cells. C) growing at a phenomenal rate as the current $60 billion industry is expected to double by 2020. D) less promising because the costs of ecosystem damage and pollution are not counted.