A scientific law may begin as a hypothesis that
A. a large group of competent observers agree as true.
B. is tested repeatedly and not contradicted.
C. both of these
D. none of the above
Answer: C
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A stone is thrown vertically upward. At the top of its path, the force acting on it is only
A. zero. B. air resistance. C. the force due to gravity. D. both the force of gravity and air resistance.
The Silk Road connected
A. China and India B. New York and Chicago C. China and Rome D. London and Paris
In a tropical wet-and-dry climate, the dry season occurs with the ____
A) high sun period (summer) B) low sun period (winter) C) close proximity of the ITCZ D) subtropical lows
Seasonal temperature variations are due primarily to the changing distance between the earth and the Sun
Indicate whether the statement is true or false