What is the likely source of lunar ice?
A) water that was present when the Moon formed
B) contamination from human exploration of the Moon
C) volcanism earlier in the Moon's history
D) impacts of meteoroids and comets
D
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What produces the 21-cm line that we use to map out the Milky Way Galaxy?
A) atomic hydrogen B) ionized hydrogen C) molecular hydrogen D) carbon monoxide E) helium
The celestial equator always passes directly overhead
Indicate whether the statement is true or false
Two equal charges, each Q, are separated by some distance. What third charge would need to be placed half way between the two charges so that the net force on each charge would be zero?
a. -Q/8 c. -Q/4 b. -Q d. -Q/2
In water, does the molecule lysergic acid diethylamide act as an acid, a base, neither or both?
A) acid B) base C) neither an acid or a base D) both as an acid and as a base