The saros cycle
a. was used in ancient times to predict eclipses.
b. is 18 years, 11 1/3 days long.
c. comes from a Greek word that means repetition.
d. all of the above
e. none of the above
D
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Indicate whether the statement is true or false
Discuss your understanding of the author's meaning in the statement, referring to efficiency of a hydrogen economy that "if solar energy is the source of the energy
, the efficiency" of the hydrogen energy production system "is of less concern."
X rays are used in radar
Indicate whether the statement is true or false