6The sideral period of the moon
a. is about 27.32 days long.
b. is the period of time for the moon to orbit Earth once with respect to the stars.
c. is the period of time between successive eclipses at a given location on Earth.
d. is the period of time from when the moon rises until the moon rises again the next night.
e. a and b above
E
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A) a hypothesis B) an observation C) a question D) a test
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Any element heavier than helium is collectively referred to as a _______________
Fill in the blank(s) with correct word