What is the correct formula for aluminum oxide?
A) AlO
B) AlO2
C) Al2O
D) Al2O3
D
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About 20,000 people of African descent live in Nova Scotia. Which of the following is a not true statement about the ancestry of these people?
A) Many are descendants of African-American loyalists who arrived in Nova Scotia during the American Revolution B) Many are descendants of escaped African-American slaves C) In the 20th and 21st centuries many Afro-Caribbean people migrated to Nova Scotia D) Many came from West Africa during the 20th century as refugees
In ________ models, the Sun is assumed as the center of the solar system.
A. geocentric B. eccentric C. heliocentric
A 2009 study found that one-third of the world's 925 major rivers experienced reduced flow from 1948 to 2004, with the majority of the reduction attributed to ________
A) overuse by cities for drinking water B) municipalities diverting treated wastewater into artificial wetlands rather than the rivers themselves C) overuse for agriculture D) dredging operations that make the rivers navigable E) the effects of climate change
How is the generation of municipal solid waste likely to change in the next 20 years?
A. Total municipal waste generation will continue at its current rate. B. Per capita generation of waste will continue to decline. C. Total municipal waste generation will decline. D. The answer cannot be determined from the graph.