Compared to the long-term historical average rate of extinction, extinction rates today are ________
A) higher
B) about the same
C) lower
D) changing from higher to lower rates in the past century
A
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What do New Jersey, Pennsylvania, and California have in common?
a. All have state of the art recycling programs. b. All have over 90 superfund sites. c. All have deep injection nuclear waste disposal. d. All were considered for potential high-level nuclear waste repositories. e. All are states where large-scale "sludge ranches" are located.
Earth's equator is an example of
A) a small circle. B) a great circle. C) a prime meridian. D) a line of equal longitude.
Why are there virtually no sediments at ocean ridges, even when they are close to land?
A) The sediments get deflected from the topographic high of the ridge. B) The sediments get buried by volcanic rocks, so are not visible. C) The crust is too young; there hasn't been enough time for sediments to accumulate. D) No one knows, it is one of the mysteries of geology.
The H1N1 flu virus is common in ________ but rarely transmitted to humans until recently
A) mosquitoes B) waterfowl C) pigs D) birds E) poultry