Simple molecules containing only carbon and hydrogen are referred to as
A) carbon hydrides
B) hydrocarbons
C) carbohydrides
D) hydrogen carbides
Question 2
Suppose you know the declination of a bright star that is now crossing your meridian. What else must you measure in order to determine your latitude?
A) the star's altitude
B) the apparent solar time
C) the current universal time
D) the star's right ascension