Meteor Crater, in Arizona, is approximately 100,000 years old
a. True
b. False
ANSWER: False
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A 50-kg sack is lifted 2 m in the same time as a 25-kg sack is lifted 4 m. The power expended in raising the 50-kg sack compared to the power used to lift the 25-kg sack is
A) twice as much. B) half as much. C) the same.
If a volcanic eruption produces a climate impact that lasts for a year or longer, the most likely culprit is:
A) the state of the climate at the time of the eruption. B) a high volume of debris ejected during the eruption. C) ash suspended in the atmosphere. D) aerosols produced by sulfur dioxide emitted from the volcano.
Determining a discrete threshold level of exposure is most difficult for
A) all carcinogens. B) most acids. C) all salts. D) almost all bases.
The total fertility rate among Italian women in 2010 was 1.4, whereas it was nearly 4.5 for women in the African country of Ivory Coast
What do these numbers mean? How are they likely to relate to the actual number of children per woman in each country and why? How are they likely to change in the future?