With each pass of a comet about the Sun, its mass
A. remains virtually unchanged.
B. is appreciably reduced.
C. actually increases.
Answer: B
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Which of the following areas in Central America has a high population density and areas of serious concern for soil erosion?
What will be an ideal response?
Which country consumes the greatest amount of energy?
A. India B. China C. Russia D. The United States
Scientists are now able to produce desirable traits in some organisms by adding, deleting, or changing segments of its DNA. This process is known as ____.
A. genetic modification B. genetic engineering C. genetic drift D. mutation E. speciation
Oil price history shows that prices have changed sharply on several occasions. Which is NOT an event that led to a sharp fluctuation in barrel price?
A) OPEC refused to sell oil to allies of Israel in 1973. B) The end of the Iran-Iraq war in 1988 led to lower prices. C) Oil companies control supply of oil in Southwest Asia in the early 70s keeping prices low. D) The U.S. government removes all subsidies in 1980 to major oil companies like Exxon-Mobil causing an increased prices. E) The Iranian Revolution in 1979 and Iran-Iraq war trigger oil shortages and higher prices.