Since 1880, the year with the highest land surface temperature in the Northern Hemisphere was
A) 1985 B) 2015 C) 1992 D) 2000 E) 1940
B
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E.G. Ravenstein considered it a "law of migration" that longer distance migrations would gravitate away from centers of economic strength
Indicate whether the statement is true or false.
What disease is diagnosed by monitoring acid phosphatase activity?
A) hepatitis B) liver cancer C) pancreatic disease D) prostate cancer
How does a fringing reef around an oceanic island become an atoll?
Rocks and sand on beaches become rounded rapidly because ________
A) the swash action of waves rolls loose material up and down the beach, where it is abraded rapidly to produce rounded grains
B) rip currents move the sand offshore rapidly, abrading the fragments
C) Beach sand is mostly calcium carbonate from reefs and so gets rounded easily
D) There is nothing particularly prominent in beaches that produces more rounding than other sedimentary processes.