The event that changes a protostar to a full-fledged star is
A. a catastrophic increase in temperature.
B. gravitational expansion.
C. the emission of light.
D. thermonuclear fusion.
E. gravitational collapse.
Answer: D
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____ was longest continuous scientific oceanographic expedition
A) The Challenger expedition B) The Fram expedition C) The Meteor expedition D) The Albatross expedition
Where is the North American Manufacturing Belt located?
A) Northeastern U.S., and southeastern Canada B) Southeastern U.S. C) Northwestern U.S. and southwestern Canada D) Great Plains E) Sunbelt states
This is the cause of most thunderstorms:
A) convergent lifting. B) frontal lifting. C) orographic lifting. D) localized convective lifting.
The ____________________ rate of increase is the rate a population would grow if it had unlimited resources.
Fill in the blank(s) with the appropriate word(s).