The life history of a star is dependent upon what?
A) The amount of helium present
B) The speed of conversion of hydrogen to carbon or oxygen
C) The initial mass
D) The amount of energy output
C
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The most successful organisms in a community have the most surviving offspring
a. True b. False
What did the differing paleomagnetic records for each continent show?
a. each continent had its own magnetic pole during successive geological periods b. that the magnetic poles for each continent had moved over geological time c. that the magnetic poles have remained in one location and each of the continents has moved d. that both the poles and the continents have moved over time e. none of these
________ accounts for 60% of global warming.
A. Nitrous oxide (N2O) B. Chlorofluorocarbons (CFC's) C. Carbon dioxide (CO2) D. Methane (CH4) E. Ozone (O3)
Which statement about vorticity is least accurate??
a. ?Earth's vorticity in the Northern Hemisphere is positive. b. ?Earth's vorticity is zero at the poles. c. ?Air that spins cyclonically possesses positive vorticity. d. ?Absolute vorticity is the sum of Earth’s vorticity and the relative vorticity. e. ?Vorticity is the measure of the spin of small air parcels.