Lightning is very common in thunderstorms. Lightning results from
A) an imbalance in energy.
B) a separation of electrical charge within the cloud.
C) air expansion.
D) rising warm updrafts.
Answer: B
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The Sgr A* black hole may contain three million solar masses
Indicate whether the statement is true or false
When U.S. annual energy use and gross national product (GNP) are graphed, the two graphs rise at the same rate until the mid-east oil shocks of the 1970s, after which
A) GNP keeps rising while energy use levels off due to global warming. B) GNP keeps rising while energy use begins to level off due to increased energy efficiency. C) energy use decreases due to declining fossil fuel supplies. D) GNP levels off while energy use keeps rising due to technological stagnation. E) total energy use increases without a similar increase in GNP, because of increased oil imports.
It is not necessary to provide navigation back to the home page from subsidiary pages.
Answer the following statement true (T) or false (F)
Rainfall associated with an advancing cold front is generally
A) drizzly. B) heavy with gusty winds. C) slow and steady. D) light to moderate, with steady mild winds.