If we divide Earth's current proven oil reserves by current annual consumption of about 26 billion barrels, we see that we have about ________ years of oil supply remaining, at present rates of consumption
A) 15
B) 30
C) 50
D) 80
E) 130
Answer: C
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Plants such as leafy spurge can double their population size every year in part because of their efficient production of large amounts of seeds. Populations that can double every year, such as leafy spurge, ________
A) exhibit exponential growth as they spread to new regions B) exhibit logistic growth C) will do so endlessly, eventually achieving a global distribution D) probably have more predators than other species
Which of the following pieces of evidence supports the plate tectonic theory?
a. The polar wandering paths of Europe show that the magnetic north pole has migrated from near Hawaii to its current position over the Arctic Ocean. b. The stripe patterns of high- and low-intensity magnetism are the same on both sides of an oceanic ridge. c. The volcanic islands that make up the Hawaiian Island chain are all the same age. d. The seafloor is oldest at the ridge crest. e. Ocean-floor sediments are thickest at the ridge crest.
If you are located at 10 degrees North and 130 degrees West, and you move to a new location that is 50 degrees farther south and 60 degrees farther west, what is your new location? Include both degrees and directions for both coordinates. Latitude:_______ Longitude_________
Fill in the blank(s) with correct word
Which of the following would be characteristic of a eutrophic lake?
A. crystal clear waters B. limited population of phytoplankton C. small supply of plant nutrients D. well-supplied with nutrients for producers E. low net primary productivity