How did the Greeks estimate the size of the earth?
A) They measured the angle of the sun above the horizon at midday in two places with different latitude and used the angle to estimate the circumference of the earth.
B) They used the height of sailing ships as they sailed over the horizon to estimate curvature of the earth, which allowed estimation of the size of the earth.
C) They didn't; everyone thought the world was flat until Columbus' time.
D) They measured the altitude of mountains in Greece, then used the distance they were lost from sight to estimate the curvature of the earth, which allowed estimation of the size of the earth.
A
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Which areas on this world map are likely to be near a plate boundary?
A) A and B
B) A and D
C) B and D
D) C and D
E) A, B, and C
The process when a group forcibly removes another group is called
A) war. B) migrational push factors. C) racism. D) ethnic cleansing. E) white flight.
In an integrated waste management approach to solid waste, which action would be given last priority?
A. compost B. reuse C. reduce packaging D. bury E. recycle
Suppose the global community came to an agreement to reduce CO2 emissions that had the same impact as the Montreal Protocol had for CFCs. Predict how CO2 levels would change over the next several decades.
A. CO2 levels would decrease significantly B. CO2 levels would stay about the same C. CO2 levels would increase significantly